Bind action to fragment: adaptive notif settings

Bug: 330608738

Test: send high pri HUN => see edu HUN from sysui
      tap HUN/action => shows adaptive notif settings page,
                        notif menu key highlighted in split screen

Test: adb shell am start-activity -a android.settings.MANAGE_ADAPTIVE_NOTIFICATIONS

Flag: com.android.systemui.notification_avalanche_throttle_hun

Change-Id: I8bc36412b6ce6364887b04d737310e6b01478964