Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Replacement for https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/2758
REF: https://gitlab.com/gitlab-com/www-gitlab-com/commit/3e23e40c7019e4e5d83390cafebcc313c8d378c1#note_12970905