Emit a warning for loops that have an else clause but no break or return.

Technically, the else: is superfluous with the return statement, but after much internal
discussion, I've changed the patch to allow this. The main point is that the indented block
is useful as a visual marker to say that the loop may end early and end execution of the whole
block, or something else might happen afterwards. That being said, I wouldn't be terribly sad
if we took it out again.

Closes #81378

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