Fix panic in custom_render_phase example (#17866)

# Objective

Fix panic in `custom_render_phase`.

This example was broken by #17764, but that breakage evolved into a
panic after #17849. This new panic seems to illustrate the problem in a
pretty straightforward way.

```
2025-02-15T00:44:11.833622Z  INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "macOS 15.3 Sequoia", kernel: "24.3.0", cpu: "Apple M4 Max", core_count: "16", memory: "64.0 GiB" }    
2025-02-15T00:44:11.908328Z  INFO bevy_render::renderer: AdapterInfo { name: "Apple M4 Max", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }
2025-02-15T00:44:12.314930Z  INFO bevy_winit::system: Creating new window App (0v1)
thread 'Compute Task Pool (1)' panicked at /Users/me/src/bevy/crates/bevy_ecs/src/system/function_system.rs:216:28:
bevy_render::batching::gpu_preprocessing::batch_and_prepare_sorted_render_phase<custom_render_phase::Stencil3d, custom_render_phase::StencilPipeline> could not access system parameter ResMut<PhaseBatchedInstanceBuffers<Stencil3d, MeshUniform>>
```

## Solution

Add a `SortedRenderPhasePlugin` for the custom phase.

## Testing

`cargo run --example custom_render_phase`

Author: rparrett

examples/shader/custom_render_phase.rs

@@ -43,7 +43,7 @@ use bevy::{
         render_phase::{
             sort_phase_system, AddRenderCommand, CachedRenderPipelinePhaseItem, DrawFunctionId,
             DrawFunctions, InputUniformIndex, PhaseItem, PhaseItemExtraIndex, SetItemPipeline,
-            SortedPhaseItem, ViewSortedRenderPhases,
+            SortedPhaseItem, SortedRenderPhasePlugin, ViewSortedRenderPhases,
         },
         render_resource::{
             CachedRenderPipelineId, ColorTargetState, ColorWrites, Face, FragmentState, FrontFace,
@@ -54,7 +54,7 @@ use bevy::{
         renderer::RenderContext,
         sync_world::MainEntity,
         view::{ExtractedView, RenderVisibleEntities, RetainedViewEntity, ViewTarget},
-        Extract, Render, RenderApp, RenderSet,
+        Extract, Render, RenderApp, RenderDebugFlags, RenderSet,
     },
 };
 use nonmax::NonMaxU32;
@@ -113,7 +113,10 @@ struct DrawStencil;
 struct MeshStencilPhasePlugin;
 impl Plugin for MeshStencilPhasePlugin {
     fn build(&self, app: &mut App) {
-        app.add_plugins((ExtractComponentPlugin::<DrawStencil>::default(),));
+        app.add_plugins((
+            ExtractComponentPlugin::<DrawStencil>::default(),
+            SortedRenderPhasePlugin::<Stencil3d, MeshPipeline>::new(RenderDebugFlags::default()),
+        ));
         // We need to get the render app from the main app
         let Some(render_app) = app.get_sub_app_mut(RenderApp) else {
             return;