Disable geo_job_artifact_replication feature flag

What does this MR do and why?

Related to gitlab-com/gl-infra/production#6664 (closed)

In this MR we found out that geo_job_artifact_replication feature flag which is shipped to self-managed causes job traces to be missing after 2 minutes. The feature flag interferes with previous_changes and breaks the after-commit storing of trace artifacts.

This is severity1 because it breaks artifacts traces when object storage and Geo are enabled. It impacts self-managed only because on Gitlab SaaS we don't have Geo enabled.

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