Log reason why HUN was allowed during avalanche

Fixes: 361385839
Bug: 356768397
Test: adb shell cmd statusbar echo -b NotifInterruptLog:verbose
      adb reboot
      adb logcat | grep VisualInterruptionDecisionProvider
Flag: com.android.systemui.notification_avalanche_suppression
Change-Id: Ifd7a3253d35c5dee7b41ba1561f768c013cc83ed