Add a note to work on dev if it is security related
Per discussion at https://gitlab.com/gitlab-org/gitlab-ce/issues/34384#note_41470132
\cc @rymai @briann @rspeicher
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Per discussion at https://gitlab.com/gitlab-org/gitlab-ce/issues/34384#note_41470132
\cc @rymai @briann @rspeicher