Inform user that current shared projects will remain shared
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/38220
@mydigitalself If this needs to go into a 10.0 patch release, let me know.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/38220
@mydigitalself If this needs to go into a 10.0 patch release, let me know.