Use GitLab Routing helpers for the documentation URL in `LfsHelper`
To reduce conflicts from changes introduced in gitlab-org/gitlab-ee!740
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/740#note_15782550
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
To reduce conflicts from changes introduced in gitlab-org/gitlab-ee!740
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/740#note_15782550