Move schedule name into Schedule (bevyengine#9600)

# Objective

- Move schedule name into `Schedule` to allow the schedule name to be
used for errors and tracing in Schedule methods
- Fixes bevyengine#9510

## Solution

- Move label onto `Schedule` and adjust api's on `World` and `Schedule`
to not pass explicit label where it makes sense to.
- add name to errors and tracing.
- `Schedule::new` now takes a label so either add the label or use
`Schedule::default` which uses a default label. `default` is mostly used
in doc examples and tests.

---

## Changelog

- move label onto `Schedule` to improve error message and logging for
schedules.

## Migration Guide

`Schedule::new` and `App::add_schedule`
```rust
// old
let schedule = Schedule::new();
app.add_schedule(MyLabel, schedule);

// new
let schedule = Schedule::new(MyLabel);
app.add_schedule(schedule);
```

if you aren't using a label and are using the schedule struct directly
you can use the default constructor.
```rust
// old
let schedule = Schedule::new();
schedule.run(world);

// new
let schedule = Schedule::default();
schedule.run(world);
```

`Schedules:insert`
```rust
// old
let schedule = Schedule::new();
schedules.insert(MyLabel, schedule);

// new
let schedule = Schedule::new(MyLabel);
schedules.insert(schedule);
```

`World::add_schedule`
```rust
// old
let schedule = Schedule::new();
world.add_schedule(MyLabel, schedule);

// new
let schedule = Schedule::new(MyLabel);
world.add_schedule(schedule);
```

benches/benches/bevy_ecs/components/archetype_updates.rs

@@ -7,7 +7,7 @@ struct A<const N: u16>(f32);
 fn setup(system_count: usize) -> (World, Schedule) {
     let mut world = World::new();
     fn empty() {}
-    let mut schedule = Schedule::new();
+    let mut schedule = Schedule::default();
     for _ in 0..system_count {
         schedule.add_systems(empty);
     }

benches/benches/bevy_ecs/empty_archetypes.rs

@@ -77,7 +77,7 @@ fn par_for_each(
 
 fn setup(parallel: bool, setup: impl FnOnce(&mut Schedule)) -> (World, Schedule) {
     let mut world = World::new();
-    let mut schedule = Schedule::new();
+    let mut schedule = Schedule::default();
     if parallel {
         world.insert_resource(ComputeTaskPool(TaskPool::default()));
     }

benches/benches/bevy_ecs/scheduling/run_condition.rs

@@ -18,7 +18,7 @@ pub fn run_condition_yes(criterion: &mut Criterion) {
     group.measurement_time(std::time::Duration::from_secs(3));
     fn empty() {}
     for amount in 0..21 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems(empty.run_if(yes));
         for _ in 0..amount {
             schedule.add_systems((empty, empty, empty, empty, empty).distributive_run_if(yes));
@@ -41,7 +41,7 @@ pub fn run_condition_no(criterion: &mut Criterion) {
     group.measurement_time(std::time::Duration::from_secs(3));
     fn empty() {}
     for amount in 0..21 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems(empty.run_if(no));
         for _ in 0..amount {
             schedule.add_systems((empty, empty, empty, empty, empty).distributive_run_if(no));
@@ -71,7 +71,7 @@ pub fn run_condition_yes_with_query(criterion: &mut Criterion) {
         query.single().0
     }
     for amount in 0..21 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems(empty.run_if(yes_with_query));
         for _ in 0..amount {
             schedule.add_systems(
@@ -100,7 +100,7 @@ pub fn run_condition_yes_with_resource(criterion: &mut Criterion) {
         res.0
     }
     for amount in 0..21 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems(empty.run_if(yes_with_resource));
         for _ in 0..amount {
             schedule.add_systems(

benches/benches/bevy_ecs/scheduling/running_systems.rs

@@ -21,7 +21,7 @@ pub fn empty_systems(criterion: &mut Criterion) {
     group.measurement_time(std::time::Duration::from_secs(3));
     fn empty() {}
     for amount in 0..5 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         for _ in 0..amount {
             schedule.add_systems(empty);
         }
@@ -33,7 +33,7 @@ pub fn empty_systems(criterion: &mut Criterion) {
         });
     }
     for amount in 1..21 {
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         for _ in 0..amount {
             schedule.add_systems((empty, empty, empty, empty, empty));
         }
@@ -73,7 +73,7 @@ pub fn busy_systems(criterion: &mut Criterion) {
         world.spawn_batch((0..ENTITY_BUNCH).map(|_| (A(0.0), B(0.0), C(0.0), D(0.0))));
         world.spawn_batch((0..ENTITY_BUNCH).map(|_| (A(0.0), B(0.0), C(0.0), E(0.0))));
         for system_amount in 0..5 {
-            let mut schedule = Schedule::new();
+            let mut schedule = Schedule::default();
             schedule.add_systems((ab, cd, ce));
             for _ in 0..system_amount {
                 schedule.add_systems((ab, cd, ce));
@@ -124,7 +124,7 @@ pub fn contrived(criterion: &mut Criterion) {
         world.spawn_batch((0..ENTITY_BUNCH).map(|_| (A(0.0), B(0.0))));
         world.spawn_batch((0..ENTITY_BUNCH).map(|_| (C(0.0), D(0.0))));
         for system_amount in 0..5 {
-            let mut schedule = Schedule::new();
+            let mut schedule = Schedule::default();
             schedule.add_systems((s_0, s_1, s_2));
             for _ in 0..system_amount {
                 schedule.add_systems((s_0, s_1, s_2));

benches/benches/bevy_ecs/scheduling/schedule.rs

@@ -46,7 +46,7 @@ pub fn schedule(c: &mut Criterion) {
 
         world.spawn_batch((0..10000).map(|_| (A(0.0), B(0.0), C(0.0), E(0.0))));
 
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems((ab, cd, ce));
         schedule.run(&mut world);
 

crates/bevy_app/src/app.rs

@@ -384,9 +384,9 @@ impl App {
         if let Some(schedule) = schedules.get_mut(&schedule) {
             schedule.add_systems(systems);
         } else {
-            let mut new_schedule = Schedule::new();
+            let mut new_schedule = Schedule::new(schedule);
             new_schedule.add_systems(systems);
-            schedules.insert(schedule, new_schedule);
+            schedules.insert(new_schedule);
         }
 
         self
@@ -403,9 +403,9 @@ impl App {
         if let Some(schedule) = schedules.get_mut(&schedule) {
             schedule.configure_set(set);
         } else {
-            let mut new_schedule = Schedule::new();
+            let mut new_schedule = Schedule::new(schedule);
             new_schedule.configure_set(set);
-            schedules.insert(schedule, new_schedule);
+            schedules.insert(new_schedule);
         }
         self
     }
@@ -421,9 +421,9 @@ impl App {
         if let Some(schedule) = schedules.get_mut(&schedule) {
             schedule.configure_sets(sets);
         } else {
-            let mut new_schedule = Schedule::new();
+            let mut new_schedule = Schedule::new(schedule);
             new_schedule.configure_sets(sets);
-            schedules.insert(schedule, new_schedule);
+            schedules.insert(new_schedule);
         }
         self
     }
@@ -798,9 +798,9 @@ impl App {
     /// # Warning
     /// This method will overwrite any existing schedule at that label.
     /// To avoid this behavior, use the `init_schedule` method instead.
-    pub fn add_schedule(&mut self, label: impl ScheduleLabel, schedule: Schedule) -> &mut Self {
+    pub fn add_schedule(&mut self, schedule: Schedule) -> &mut Self {
         let mut schedules = self.world.resource_mut::<Schedules>();
-        schedules.insert(label, schedule);
+        schedules.insert(schedule);
 
         self
     }
@@ -811,7 +811,7 @@ impl App {
     pub fn init_schedule(&mut self, label: impl ScheduleLabel) -> &mut Self {
         let mut schedules = self.world.resource_mut::<Schedules>();
         if !schedules.contains(&label) {
-            schedules.insert(label, Schedule::new());
+            schedules.insert(Schedule::new(label));
         }
         self
     }
@@ -841,7 +841,7 @@ impl App {
         let mut schedules = self.world.resource_mut::<Schedules>();
 
         if schedules.get(&label).is_none() {
-            schedules.insert(label.dyn_clone(), Schedule::new());
+            schedules.insert(Schedule::new(label.dyn_clone()));
         }
 
         let schedule = schedules.get_mut(&label).unwrap();

crates/bevy_app/src/main_schedule.rs

@@ -161,13 +161,13 @@ pub struct MainSchedulePlugin;
 impl Plugin for MainSchedulePlugin {
     fn build(&self, app: &mut App) {
         // simple "facilitator" schedules benefit from simpler single threaded scheduling
-        let mut main_schedule = Schedule::new();
+        let mut main_schedule = Schedule::new(Main);
         main_schedule.set_executor_kind(ExecutorKind::SingleThreaded);
-        let mut fixed_update_loop_schedule = Schedule::new();
+        let mut fixed_update_loop_schedule = Schedule::new(RunFixedUpdateLoop);
         fixed_update_loop_schedule.set_executor_kind(ExecutorKind::SingleThreaded);
 
-        app.add_schedule(Main, main_schedule)
-            .add_schedule(RunFixedUpdateLoop, fixed_update_loop_schedule)
+        app.add_schedule(main_schedule)
+            .add_schedule(fixed_update_loop_schedule)
             .init_resource::<MainScheduleOrder>()
             .add_systems(Main, Main::run_main);
     }

crates/bevy_ecs/src/change_detection.rs

@@ -149,7 +149,7 @@ pub trait DetectChangesMut: DetectChanges {
     /// # score_changed.initialize(&mut world);
     /// # score_changed.run((), &mut world);
     /// #
-    /// # let mut schedule = Schedule::new();
+    /// # let mut schedule = Schedule::default();
     /// # schedule.add_systems(reset_score);
     /// #
     /// # // first time `reset_score` runs, the score is changed.
@@ -214,7 +214,7 @@ pub trait DetectChangesMut: DetectChanges {
     /// # score_changed_event.initialize(&mut world);
     /// # score_changed_event.run((), &mut world);
     /// #
-    /// # let mut schedule = Schedule::new();
+    /// # let mut schedule = Schedule::default();
     /// # schedule.add_systems(reset_score);
     /// #
     /// # // first time `reset_score` runs, the score is changed.

crates/bevy_ecs/src/event.rs

@@ -1034,7 +1034,7 @@ mod tests {
         world.send_event(TestEvent { i: 3 });
         world.send_event(TestEvent { i: 4 });
 
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems(|mut events: EventReader<TestEvent>| {
             let mut iter = events.iter();
 

crates/bevy_ecs/src/query/mod.rs

@@ -789,7 +789,7 @@ mod tests {
             }
         }
 
-        let mut schedule = Schedule::new();
+        let mut schedule = Schedule::default();
         schedule.add_systems((propagate_system, modify_system).chain());
         schedule.run(&mut world);
         world.clear_trackers();