Validate the foreign key & add to routing table commit_id

What does this MR do and why?

Validate the foreign key & add to routing table commit_id

This is the second migration to validate the foreign key synchronously

See https://docs.gitlab.com/ee/development/database/add_foreign_key_to_existing_column.html#add-a-migration-to-validate-the-fk-synchronously

Changelog: added

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Before	After

How to set up and validate locally

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Related to #422836 (closed)