Prevent visible background users from updating the data managed by...

Prevent visible background users from updating the data managed by NotificationListers object in MUMD

- The main use case for visible background users is the Automotive multi-display configuration where a passenger can use a secondary display while the driver is using the main display.
- NotificationListeners is designed only for the current user and work profile.
- We added a condition to prevent visible background users from updating the data managed within the NotificationListeners object.

Bug: 374182059
Flag: EXEMPT bugfix
Test: manual
(cherry picked from https://partner-android-review.googlesource.com/q/commit:805d66fcaa6dc484827a030267e09c15c3555001)

Change-Id: I6a3bc07352f19359405c29517be7bed001408540