Added info about Admin user ability to push to protected branches.
This info is missing from the docs that an Gitlab admin is allowed to push to protected branches. ZD info: https://gitlab.zendesk.com/agent/tickets/54796
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This info is missing from the docs that an Gitlab admin is allowed to push to protected branches. ZD info: https://gitlab.zendesk.com/agent/tickets/54796