Geo: Add bulk registry reverification service using new BaseBatchBulkUpdateService

Chloe Fonsrequested to merge
574035-add-bulk-registry-reverification-service into master

What does this MR do and why?

Add bulk registry reverification service

This new service uses the BaseBatchBulkUpdateService introduced in !206339 (merged), which provides:

  • Support for composite primary keys and large tables using GitLab's standard keyset pagination
  • Consistent batching patterns following GitLab documented batching practices

It will replace the existing BulkMarkVerificationPendingService, which has been known to cause bugs in Dedicated.

Next step will be to replace the existing code with this service.

References

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Related to #574035

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