Finalize BackfillCiRunnersPartitionedTable

What does this MR do and why?

This MR finalizes the BackfillCiRunnersPartitionedTable migration that was merged in %17.6, and completed 2 months ago on .com.

Changelog: added

References

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• Finalize BackfillCiRunnersPartitionedTable migr... (#504277 - closed)
• Requeue backfill of ci_runners_e59bb2812d table (!176848 - merged)
• !166520 (diffs)
• Finalize QueueBackfillPartitionCiRunners backgr... (#497292 - closed)

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