Migrate merge request dependencies
<!--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=537593) </details> <!--IssueSummary end--> ### Problem Users expect important object relationships to be preserved during project migration. This should include the various [merge request dependencies](https://docs.gitlab.com/user/project/merge_requests/dependencies/) for MRs. ![image.png](/uploads/d303826d211f0179d63e1dca836a967c/image.png){width=566 height=237} They may be added when creating/editing an MR, e.g. ![image.png](/uploads/eceb4bd426007d054c5c5d5b05b7ae75/image.png){width=555 height=276} ### Proposed solution Relations for merge request dependencies should be migrated as part of a project import.
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