Add additonal logging around user switching in KeyguardUpdateMonitor

Face auth either gets cancelled or doesn't run because we think user switching is currently in progress,
add more logs to KUM to identify which user switching API provides the information at the right time.

Bug: 285516490
Bug: 263757590
Test: NA, logging changes
Change-Id: I996044d65466c752b3c5256b27ca160edf7e03d4