Trigger mergeRequestMergeStatusUpdated when MR is closed

Problem to solve

We want the merge widget to show updated status when MR is closed or reopened.

Proposal

Trigger the mergeRequestMergeStatusUpdated subscription when:

• MR is closed.
• MR is re-opened (not needed anymore since we transition merge_status to unchecked on reopen and we already have a trigger when that happens).

We can trigger the subscription in MergeRequests::CloseService.

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