Migrate geo job_artifact_registry artifact_id and id to bigint

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With the transition to a bigint in the primary database we need to transition job_artifact_registry.artifact_id to a bigint.

We also need to transition job_artifact_registry.id to a bigint.

Definition of Done

• A migration is created to transition job_artifact_registry.id
• A migration is created to transition job_artifact_registry.artifact_id

Considerations

Since there's no write access to the primary database, we'll need to use a different type of background migration to do this. Or add something to support the new kind in geo.

CC @geo-team @iroussos