Ensure fingerprint setup is shown once after face

Adds an activity result extra during multi-biometric enroll that
ensures fingerprint setup will not be repeated multiple times if
explicitly finished or skipped by the user. Also updates various
activities in the stack to ensure that they handle all possible result
codes correctly and pass along result data.

Test: Manually skip and complete at each stage of multi-biometric enroll
Test: Manually test single-biometric enroll flows for SUW and Settings

Fixes: 193601823
Change-Id: Ic5a8306068eb4c32009f146ad6fff824fde25a11

src/com/android/settings/biometrics/MultiBiometricEnrollHelper.java

@@ -37,6 +37,7 @@ public class MultiBiometricEnrollHelper {
     private static final int REQUEST_FINGERPRINT_ENROLL = 3001;
 
     public static final String EXTRA_ENROLL_AFTER_FACE = "enroll_after_face";
+    public static final String EXTRA_SKIP_PENDING_ENROLL = "skip_pending_enroll";
 
     @NonNull private final FragmentActivity mActivity;
     private final long mGkPwHandle;