Add serializer for environments
What does this MR do?
This will make it possible to create a payload need in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7015 for use with Vue.
Why was this MR needed?
Closes #23886 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This will make it possible to create a payload need in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7015 for use with Vue.
Closes #23886 (closed)