Trigger merge request webhook when `detailed_merge_status` mergeable
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=339740) </details> <!--IssueSummary end--> ## Problem to Solve Asynchronous checks for `detailed_merge_status` mean that the API needs to be continually polled to see if a merge request is mergeable. This creates problems in automation it generates excessive requests and bad information that needs to be checked before merging can happen. ## Proposal When the `detailed_merge_status` check is complete, a webhook should be triggered to inform listening services of it's updated status.
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