POC for importing chosen relation between two GitLab projects
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=456704) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=456704) </details> <!--IssueSummary end--> This is to do POC for https://gitlab.com/gitlab-org/gitlab/-/issues/430789+, as [proposed](https://gitlab.com/gitlab-org/gitlab/-/issues/430789#note_1865490310) and with the outcomes refine the implementation issue.
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