bors 3f17c5c388 Auto merge of #10924 - est31:manual_let_else_question_mark, r=Centri3,flip1995,Manishearth
Don't lint manual_let_else in cases where ? would work

Don't lint `manual_let_else` where the question mark operator `?` would be sufficient, that is, mostly in cases like:

```Rust
let v = if let Some(v) = ex { v } else { return None };
```

Also, this PR emits the `question_mark` lint for `let...else` patterns that could be written with `?` (also, only `return None` like cases).

```
changelog: [`manual_let_else`]: don't lint in cases where question_mark already lints
changelog: [`question_mark`]: lint for `let Some(...) = ex else { return None };`
```

Fixes  #8755
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