Merge branch '301124-merge-request-setting-audit-events' into 'master'

Add audit events for merge request settings

See merge request !83922 (merged)

(cherry picked from commit 8c6f4a33)

859d2a8b Add audit events for merge request settings e6f7a15c Apply 10 suggestion(s) to 5 file(s) 7b03a8e9 Disable audit on column change from nil to false/blank 3207a415 Move blank to blank logic in auditor

Related to #301124 (closed)