Prevent calling StatusBarManagerInternal for visible background users

The StatusBarManagerService is not currently configured to properly
handle visible background users running concurrently with the primary
user. To prevent interactions from these background users from affecting
the primary user, it is necessary to guard calls via
StatusBarManagerInternal until the StatusBarManagerService supports
concurrent users properly.

Bug: 350777850
Test: atest com.android.server.wm
Flag: NONE bugfix
Change-Id: Id560500ce96b0b776f4a2c9426da2b2fd9e58074