Finalize BackfillIssueTrackerDataShardingKey migration
What does this MR do and why?
This MR finalizes BackfillIssueTrackerDataShardingKey migration. As per https://docs.gitlab.com/development/database/batched_background_migrations/#finalize-a-batched-background-migration this migration is qualified for finalization:
- It was completed at 2025-06-23.
- Migration was added in 18.2, which is the required stop version
References
Screenshots or screen recordings
| Before | After |
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How to set up and validate locally
MR acceptance checklist
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