Trigger merge request webhook when detailed_merge_status mergeable

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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.