Update warn message for MySQL fix
ZD: https://gitlab.zendesk.com/agent/tickets/39529
The current warn message is ambiguous. We should mention MySQL.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
ZD: https://gitlab.zendesk.com/agent/tickets/39529
The current warn message is ambiguous. We should mention MySQL.