Auto merge of #12870 - lrh2000:sig-drop-while, r=blyxyas

`significant_drop_in_scrutinee`: Trigger lint also for scrutinees in `while let` and `if let`

This lint should also work for `if let` and `while let`, so this PR makes it actually work.

For `while let`, I can't think of any reason why this lint shouldn't be enabled. The only problem is that the lint suggests moving the significant drop above the `while let`, which is clearly invalid in the case of `while let`. I don't know if this is fixable, but this PR simply disables the wrong suggestions.

For `if let`, it seems that another lint called `if_let_mutex` has some overlapping functionality. But `significant_drop_in_scrutinee` is a bit stricter, as it will trigger even if the `else` branch does not try to lock the same mutex.

changelog: [`significant_drop_in_scrutinee`]: Trigger lint also for scrutinees in `while let` and `if let`.

r? `@blyxyas` (the third PR as promised in https://github.com/rust-lang/rust-clippy/pull/12740#issuecomment-2094876350, thanks for your review!)

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