Rollup merge of #90521 - jhpratt:stabilize-destructuring_assignment, …

…r=jackh726,pnkfelix

Stabilize `destructuring_assignment`

Closes #71126

- [Stabilization report](rust-lang/rust#71126 (comment))
- [Completed FCP](rust-lang/rust#71126 (comment))

`@rustbot` label +F-destructuring-assignment +T-lang
Also needs +relnotes but I don't have permission to add that tag.

tests/ui/crashes/ice-6250.stderr

@@ -1,14 +1,3 @@
-error[E0658]: destructuring assignments are unstable
- --> $DIR/ice-6250.rs:12:25
- |
-LL | Some(reference) = cache.data.get(key) {
- | --------------- ^
- | |
- | cannot assign to this expression
- |
- = note: see issue #71126 <https://github.com/rust-lang/rust/issues/71126> for more information
- = help: add `#![feature(destructuring_assignment)]` to the crate attributes to enable
-
 error[E0601]: `main` function not found in crate `ice_6250`
  --> $DIR/ice-6250.rs:4:1
  |
@@ -41,7 +30,7 @@ error[E0308]: mismatched types
 LL | Some(reference) = cache.data.get(key) {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found `()`
 
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0308, E0601, E0658.
+Some errors have detailed explanations: E0308, E0601.
 For more information about an error, try `rustc --explain E0308`.