Add static linter to validate Bulk Import's EE stage files
<!--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=346367) </details> <!--IssueSummary end--> Suggestion from https://gitlab.com/gitlab-org/gitlab/-/merge_requests/74722#note_741382658 Whe adding new pipelines to: - `lib/bulk_imports/projects/stage.rb` - `lib/bulk_imports/groups/stage.rb` We also need to add them to: - `ee/lib/ee/bulk_imports/projects/stage.rb` - `ee/lib/ee/bulk_imports/groups/stage.rb` Which is not obvious and sometimes EE spec can not fail either, meaning that this will get merged unnoticed. We should either add a static linter to validate EE files, or only validate EE pipelines in EE specific specs, since CE pipelines are already validated in CE specs.
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