Direct Transfer - Extend E2Es to ensure group items are migrated correctly
<!--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=498398) </details> <!--IssueSummary end--> Currently our nightly tests for Direct Transfer migrate projects only: https://gitlab.com/gitlab-org/manage/import/import-metrics: ### Screenshot from a recent run posted in `#import-export-metrics` ![image](/uploads/f2a5804ffd323e846e613895f7864774/image.png) This is problematic because it won't catch issues related to migrated group items. We should extend our specs by adding a test case to ensure that group items (such as Epics) are correctly migrated
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