Show skipped MRs in project import statistics
<!--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=537943) </details> <!--IssueSummary end--> This is the front-end MR for https://gitlab.com/gitlab-org/gitlab/-/issues/537939. Once the skipped MR data is available via the API, we should show it in the front-end for the project import statistics. Sample designs ([source](https://gitlab.com/gitlab-org/gitlab/-/issues/463562#note_2407957450)): | current view | import_history_table | | ------ | ------ | | ![CleanShot_2025-03-20_at_12.48.01_2x](/uploads/d98e0d0b3ce8811634eb1659d6cd191c/CleanShot_2025-03-20_at_12.48.01_2x.png) | ![CleanShot_2025-03-20_at_12.45.43_2x](/uploads/ef69199c8e0d318919da06cda8fc9599/CleanShot_2025-03-20_at_12.45.43_2x.png) | The text should be "Excluded for lack of diffs"[^text] [^text]: https://gitlab.com/gitlab-org/gitlab/-/issues/463562#note_2449430962 #### Docs Update the docs about the skipped items and why they are skipped.
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