Prepare geo_job_artifact_deleted_events table

What does this MR do?

Prepare conversion of geo_job_artifact_deleted_events.job_artifact_id to bigint because this references ci_job_artifacts.id.

Related to #331789 (closed)

Migration output

Up

== 20210525100539 InitializeConversionOfGeoJobArtifactDeletedEventsToBigint: migrating
-- table_exists?(:geo_job_artifact_deleted_events)
   -> 0.0017s
-- column_exists?(:geo_job_artifact_deleted_events, :id)
   -> 0.0016s
-- column_exists?(:geo_job_artifact_deleted_events, :job_artifact_id)
   -> 0.0011s
-- columns(:geo_job_artifact_deleted_events)
   -> 0.0011s
-- add_column(:geo_job_artifact_deleted_events, "job_artifact_id_convert_to_bigint", :bigint, {:default=>0, :null=>false})
   -> 0.0060s
== 20210525100539 InitializeConversionOfGeoJobArtifactDeletedEventsToBigint: migrated (0.0315s)

== 20210525100603 BackfillGeoJobArtifactDeletedEventsForBigintConversion: migrating
-- table_exists?(:geo_job_artifact_deleted_events)
   -> 0.0013s
-- column_exists?(:geo_job_artifact_deleted_events, :id)
   -> 0.0012s
-- column_exists?(:geo_job_artifact_deleted_events, :job_artifact_id)
   -> 0.0010s
-- column_exists?(:geo_job_artifact_deleted_events, "job_artifact_id_convert_to_bigint")
   -> 0.0009s
unknown OID 28: failed to recognize type of 'relfrozenxid'. It will be treated as String.
unknown OID 1034: failed to recognize type of 'relacl'. It will be treated as String.
unknown OID 194: failed to recognize type of 'relpartbound'. It will be treated as String.
== 20210525100603 BackfillGeoJobArtifactDeletedEventsForBigintConversion: migrated (0.0513s)

Down

== 20210525100603 BackfillGeoJobArtifactDeletedEventsForBigintConversion: reverting
-- execute("DELETE FROM batched_background_migrations WHERE job_class_name = 'CopyColumnUsingBackgroundMigrationJob' AND table_name = 'geo_job_artifact_deleted_events' AND column_name = 'id' AND job_arguments = '[[\"job_artifact_id\"],[\"job_artifact_id_convert_to_bigint\"]]'")
   -> 0.0023s
== 20210525100603 BackfillGeoJobArtifactDeletedEventsForBigintConversion: reverted (0.0025s)

== 20210525100539 InitializeConversionOfGeoJobArtifactDeletedEventsToBigint: reverting
-- remove_column(:geo_job_artifact_deleted_events, "job_artifact_id_convert_to_bigint")
   -> 0.0022s
== 20210525100539 InitializeConversionOfGeoJobArtifactDeletedEventsToBigint: reverted (0.0056s)

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