Fix icon touch dialog in Enrolling page

1. Fix icon touch dialog not shown in Enrolling page for SFPS and RFPS
   devices
2. Remove AccessibilityRepository and VibratorRepository because they
   only bypass info w/o actual effect.
3. Add/Refine missing test cases for FingerprintRepositoryTest,
   CredentailModelTest, AutoCredentialViewModelTest,
   FingerprintEnrollEnrollingViewModelTest,
   FingerprintEnrollFindSensorViewModelTest,
   FingerprintEnrollIntroViewModelTest

Bug: 271535048
Bug: 271220339
Test: atest FingerprintEnrollmentActivityTest CredentialModelTest
      FingerprintRepositoryTest AutoCredentialViewModelTest
      FingerprintEnrollEnrollingViewModelTest
      FingerprintEnrollFindSensorViewModelTest
      FingerprintEnrollIntroViewModelTest
Test: Manually test enrollment
Change-Id: I7d1ed935e156bbd41d5da63902683e430fd3fc1f