Cleanup legacy artifact background migration
What does this MR do?
There is a counter MR in EE side due to a small conflict. Please merge EE MR at first
What are the relevant issue numbers?
Close https://gitlab.com/gitlab-org/gitlab-ce/issues/46866
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - [-] Documentation created/updated
- [-] Tests added for this feature/bug
- [-] Tested in all supported browsers
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Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides - [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
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Security reports checked/validated by reviewer
Edited by Andreas Brandl