<!--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=250351) </details> <!--IssueSummary end--> This is a follow up issue for the NOT NULL constraint that has been added in scope of https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41663 Add NOT NULL constraint validation migration for `GroupImportState` model as per https://docs.gitlab.com/ee/development/database/not_null_constraints.html#validate-the-text-limit-next-release guidelines. It should be added to the next release after merged https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41663 (13.5/13.6)