[BiometricsV2] Refine fingerprint ui and flow

1. Fix "No thanks" become 2 lines, and fix the status when new
   fingerprint enrolled.
2. Fix Finish page shows again after pressing back from a new Finish
   page
3. Fix FindSensor page shows again after max number of fingerprint
   has reached.
4. Add missing tests, and remove some bypass-only tests

Bug: 279134177
Bug: 279380583
Bug: 279386539
Bug: 279394069
Test: atest FingerprintEnrollIntroViewModelTest
    FingerprintEnrollFindSensorViewModelTest
    FingerprintEnrollEnrollingViewModelTest
    FingerprintEnrollmentViewModelTest FingerprintEnrollmentActivityTest
Test: manually test 1, 2, and 3
Change-Id: I3797ceed8e7d6c10a4b4711f8bff8d7f222f0923

src/com/android/settings/biometrics2/ui/viewmodel/FingerprintEnrollmentViewModel.java

@@ -87,7 +87,6 @@ public class FingerprintEnrollmentViewModel extends AndroidViewModel {
     @NonNull
     public ActivityResult getOverrideActivityResult(@NonNull ActivityResult result,
             @Nullable Bundle generatingChallengeExtras) {
-        // TODO write tests
         final int newResultCode = mIsNewFingerprintAdded
                 ? BiometricEnrollBase.RESULT_FINISHED
                 : (mRequest.isAfterSuwOrSuwSuggestedAction()
@@ -165,6 +164,14 @@ public class FingerprintEnrollmentViewModel extends AndroidViewModel {
         outState.putBoolean(SAVED_STATE_IS_NEW_FINGERPRINT_ADDED, mIsNewFingerprintAdded);
     }
 
+    /**
+     * Gets the result about fingerprint enrollable
+     */
+    public boolean isMaxEnrolledReached(int userId) {
+        return mFingerprintRepository.getMaxFingerprints()
+                <= mFingerprintRepository.getNumOfEnrolledFingerprintsSize(userId);
+    }
+
     /**
      * The first sensor type is UDFPS sensor or not
      */