Remove geo_bulk_notifier_cron
In gitlab-org/gitlab-ee!2644 the use of System Hooks is removed for GitLab Geo. So there no longer needs to be a cron job that notifies secondary nodes.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
In gitlab-org/gitlab-ee!2644 the use of System Hooks is removed for GitLab Geo. So there no longer needs to be a cron job that notifies secondary nodes.