Implement “Set up Face or Fingerprint Unlock first” page

The activity which instructs the user to set up face or fingerprint unlock before setting the watch unlock

Bug: 264813445
Bug: 264962961
Test: make RunSettingsRoboTests ROBOTEST_FILTER=ActiveUnlockRequireBiometricSetupTest
Change-Id: I556c62b6b8102f6e15045a37cf506c0c0eedf733

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

@@ -495,7 +495,13 @@ public class BiometricEnrollActivity extends InstrumentedActivity {
     @Override
     public void finish() {
         if (mGkPwHandle != null) {
-            BiometricUtils.removeGatekeeperPasswordHandle(this, mGkPwHandle);
+            // When launched as InternalActivity, the mGkPwHandle was gotten from intent extra
+            // instead of requesting from the user. Do not remove the mGkPwHandle in service side
+            // for this case because the caller activity may still need it and will be responsible
+            // for removing it.
+            if (!(this instanceof InternalActivity)) {
+                BiometricUtils.removeGatekeeperPasswordHandle(this, mGkPwHandle);
+            }
         }
         super.finish();
     }