[BiometricsV2] IconTouchDialog continue enroll

When user clicks "OK" in FingerprintEnrollEnrollingIconTouchDialog,
continue enrolling.

Bug: 276416053
Test: atest FingerprintEnrollEnrollingViewModelTest
      FingerprintEnrollmentActivityTest
Test: Manually check enrolling status as clicking "OK" button on
      FingerprintEnrollEnrollingIconTouchDialog after enabling
      biometrics v2 v2 through feature flag.
Change-Id: I028723acfe35e5119e43b6860022c7432fc2ae0e