Finalize the backfill migration for onboarding status step url
What does this MR do and why?
Finalize the backfill migration for onboarding status step url
- finished as per !145041 (comment 1801378958)
- followed https://docs.gitlab.com/ee/development/database/batched_background_migrations.html#finalize-a-batched-background-migration
Changelog: other
MR acceptance checklist
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Related to #443818 (closed)