Investigate async race condition in MergeRequest::RefreshService
<!--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=373846) </details> <!--IssueSummary end--> We identified a race condition in `MergeRequest::RefreshService` that we suspect is due to an async process OR multiple calls to the service firing. We patched the immediate issue by adding a 10-second delay to the worker to allow for whatever the issue is to clear, but this is more of a bandage than a solution. https://gitlab.com/gitlab-org/gitlab/-/merge_requests/96933#note_1097492625
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