Set arbitrary "Mirror user" for Repository Mirroring
<!--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=4498) </details> <!--IssueSummary end--> Please allow: 1. (At the very minimum) GitLab Admin to set any user as "mirror user". 2. (Preferred solution) Group/subgroup Master to set any member of group/subgroup. ![image](/uploads/9e03ddae3a468cef1e812d116d7cedc3/image.png)
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