Finalize BBM BackfillX509TablesProjectId
What does this MR do and why?
Contributes to #553481
Finalize batched migration Add batched background migration to backfill X.... (!206669 - merged)
The original migration was added in 18.5 (required stop).
Finalizing a batched background migration is done by calling ensure_batched_background_migration_is_finished, but only if the migration was added in or before the last required stop.
It should be possible to finalize it in 18.6.
References
Sharding Key Implementation for `x509_issuers` ... (#553481)
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Related to #553481
Edited by Vasilii Iakliushin