Remove slack channel from Premium Support
Closes https://gitlab.com/gitlab-com/support/issues/326
\cc @ChadMalchow please communicate to the Sales team.
\cc @lbot
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Closes https://gitlab.com/gitlab-com/support/issues/326
\cc @ChadMalchow please communicate to the Sales team.
\cc @lbot