Bouncer message updates for secure lock device

Updates logic for message shown on the bouncer during the primary auth step
and the biometric auth step of secure lock device

Fixes: 396639472
Bug: 401645997
Bug: 396641431
Flag: android.security.secure_lock_device
Test: atest AuthenticationRepositoryTest
Test: atest BouncerMessageInteractorTest
Test: atest BouncerMessageViewModelTest
Test: atest BouncerOverlayContentViewModelTest
Change-Id: I3575ac29009dadfc18ad7265be0ca96981145c0c