Trigger mergeRequestMergeStatusUpdated when MR gets closed
What does this MR do and why?
When merge request gets closed, 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 closed.
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 #372519 (closed)