Auto merge of #12150 - ithinuel:add_misleading_use_of_ok, r=y21

Add lint for `unused_result_ok`

This PR adds a lint to capture the use of `expr.ok();` when the result is not _really_ used.

This could be interpreted as the result being checked (like it is with `unwrap()` or `expect`) but
it actually only ignores the result.

`let _ = expr;` expresses that intent better.

This was also mentionned in #8994 (although not being the main topic of that issue).

changelog: [`misleading_use_of_ok`]: Add new lint to capture `.ok();` when the result is not _really_ used.

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