Port of prevent-project-transfer to EE
Port of the prevent project transfer to EE based on this MR for CE:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11214
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Port of the prevent project transfer to EE based on this MR for CE:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11214