Fix issue's note cache expiration after delete

M. Hasbini requested to merge 0xbsec/gitlab-ce:30457-expire-note-destroy into master

What does this MR do?

expire_etag_cache when a note get destroyed.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #30457 (closed)

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