Add tests into FingerprintEnrollFinishViewModelTest and
FingerprintEnrollProgressViewModelTest. and also remove mDoneLiveData
from FingerprintEnrollProgressViewModel because no one uses it.
Bug: 271220339
Test: atest FingerprintEnrollFinishViewModelTest
FingerprintEnrollProgressViewModelTest
Change-Id: Id74da29b7730a3e7feb8d0b263c28c8192adad9c