9/n: Remove MetricsLogger and Constants from biometrics

1) MetricsLogger is succeeded by biometric atoms
2) As a result, constants can be deleted as well

This removes unnecessary "coupling interfaces" in the ClientMonitor
subclasses.

Bug: 157790417
Test: Enroll, auth, remove, not affected

Change-Id: I2aab38c2f24747bb983bd7250ddafb383a2f9518