Trigger mergeRequestMergeStatusUpdated when MR gets approved/unapproved
What does this MR do and why?
When merge request gets approved/unapproved, it affects the mergeability of the merge request.
Since we need to update the merge widget in real-time, we need to let the subscribers know about it. To do this, we trigger the subscription whenever a MR is approved/unapproved.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #372520 (closed)