BulkImports: Add a configuration trait on `bulk_imports` factory
<!--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=325162) </details> <!--IssueSummary end--> The following discussion from !56242 should be addressed: - [ ] @arturoherrero started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56242#note_531328925): > Same question https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56242/diffs#note_531318997. > > I think one of the factories seems to need this, maybe we can create a trait or something similar > > https://github.com/thoughtbot/factory_bot/blob/master/GETTING_STARTED.md#traits
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