Add missing import statements
What does this MR do?
Add missing important statements that caused JavaScript to crash on several pages.
What are the relevant issue numbers?
backport of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2791
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add missing important statements that caused JavaScript to crash on several pages.
backport of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2791