Fixes group policy specs on MySQL.
Aims to fix failing specs as seen in https://gitlab.com/gitlab-org/gitlab-ce/issues/36810
\cc @rspeicher
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Aims to fix failing specs as seen in https://gitlab.com/gitlab-org/gitlab-ce/issues/36810
\cc @rspeicher