This reverts merge request !6936 (merged).
With @rymai's recommendation of keeping it as one SSOT, I've created https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13206 to put the changes in gitlab docs instead
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This reverts merge request !6936 (merged).
With @rymai's recommendation of keeping it as one SSOT, I've created https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13206 to put the changes in gitlab docs instead