Auto-merge and the /merge API Endpoint

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Problem to Solve

Many integrations with GitLab around merging need to call the /merge endpoint. This endpoint requires a merge request to be completely ready to merge prior to being able to merge. If the merge request is not ready the endpoint returns a 422 error. The only way for a consumer to figure out what's going on is then to call the merge request API and get the detailed_merge_status.

Proposal

When calling the /merge endpoint, that should just set a merge request to auto-merge. Then when the merge request is ready, the merge will happen. If the merge request is ready to merge, then calling /merge will execute the existing behavior.