Resolve N+1 query issue with discussions
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/33013
Not technically a regression, sine non-diff discussions were introduced in 9.1, not 9.2.
Before
After
Edited by Douwe Maan
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/33013
Not technically a regression, sine non-diff discussions were introduced in 9.1, not 9.2.