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).

From documentation

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

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