return can be removed from the last stmt of a block if it has an expr

[samueltardieu]

changelog: [needless_return_with_question_mark]: lint more cases when the block in which the return is located has a final expression

Fixes #16958

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[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.