Migrate project/group memberships of project/groups
<!--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=395634) </details> <!--IssueSummary end--> ### Problem - One can set projects/groups as members of projects/groups - Performing a direct migration for a group results in this assignments being lost For example as below, on the target instance this assignment does not exist: ![image](/uploads/1d4a653c5227cfe471ac19774cd4c7e5/image.png)
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