Add UX Demo
Demo script for https://gitlab.com/gitlab-org/gitlab-ce/issues/20296, part of https://gitlab.com/gitlab-org/gitlab-ce/issues/19793.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Demo script for https://gitlab.com/gitlab-org/gitlab-ce/issues/20296, part of https://gitlab.com/gitlab-org/gitlab-ce/issues/19793.