Hide Udfps Overlay together with system transitions

Prevent the UDFPS overlay from showing when system dialogs are
expected to be closed. Since the UDFPS affordances are not
actually shown in the application's window, we should nicely
hide the UDFPS overlay together with the system transitions.

1) Adds IUdfpsOverlayControllerCallback for SysUI to notify
   FingerprintService of per-session events.
2) Adds AcquisitionClient#onUserCanceled, which notifies the
   caller of ERROR_USER_CANCELED, and then cancels the HAL
   request

Bug: 178403701
Test: Enroll, swipe up. UDFPS affordances animate away together
      with the activity. BiometricScheduler logs also indicate
      enrollment canceled.
Test: atest AcquisitionClientTest
Test: atest UdfpsControllerTest

Change-Id: I0b2c9eb20ef0686e426ea12896769e4df077cadb