Update DISALLOW_USER_SWITCH DeviceOwnerPositiveTest descriptions

- Set DISALLOW_ADD_USER when checking DO status, on behalf of ManagedProvisioning which is not run for CtsVerifier
- Added button to create user that is not setup
- Update description of DISALLOW_USER_SWITCH test

Bug: 71694430
Test: CTSVerifier DeviceOwnerPositiveTest - DISALLOW_USER_SWITCH
Change-Id: I203dcbc367ebb4766e038f65bd3a049268c49ea0
3 files changed