Rollup merge of #90933 - compiler-errors:master, r=estebank

Fix await suggestion on non-future type

Remove a match block that would suggest to add `.await` in the case where the expected type's `Future::Output` equals the found type. We only want to suggest `.await`ing in the opposite case (the found type's `Future::Output` equals the expected type).

The code sample is here: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=6ba6b83d4dddda263553b79dca9f6bcb

Before:
```
➜  ~ rustc --edition=2021 --crate-type=lib test.rs
error[E0308]: `match` arms have incompatible types
 --> test.rs:4:14
  |
2 |       let x = match 1 {
  |  _____________-
3 | |         1 => other(),
  | |              ------- this is found to be of type `impl Future`
4 | |         2 => other().await,
  | |              ^^^^^^^^^^^^^ expected opaque type, found enum `Result`
5 | |     };
  | |_____- `match` arms have incompatible types
  |
  = note: expected type `impl Future`
             found enum `Result<(), ()>`
help: consider `await`ing on the `Future`
  |
4 |         2 => other().await.await,
  |                           ++++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
```

After:
```
➜  ~ rustc +stage1 --edition=2021 --crate-type=lib test.rs
error[E0308]: `match` arms have incompatible types
 --> test.rs:4:14
  |
2 |       let x = match 1 {
  |  _____________-
3 | |         1 => other(),
  | |              ------- this is found to be of type `impl Future`
4 | |         2 => other().await,
  | |              ^^^^^^^^^^^^^ expected opaque type, found enum `Result`
5 | |     };
  | |_____- `match` arms have incompatible types
  |
  = note: expected type `impl Future`
             found enum `Result<(), ()>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
```

Fixes #90931