Fix multiple "Unassigned" users being listed in the filters
When switching between different groupings, it is common for multiple unassigned users to become listed in the filters box - this MR addresses that behaviour.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
When switching between different groupings, it is common for multiple unassigned users to become listed in the filters box - this MR addresses that behaviour.