Allow firing the LOST_INTERNET intent immediately in config

When config_notifyNoInternetAsDialogWhenHighPriority is on, the
LOST_INTERNET notification intent should be fired immediately
rather than as a pending intent.

Bug: 281970908
Test: Improve test for this in NetworkNotificationManagerTest
Change-Id: I88565839a12a1ab4b096f763250944ebaf6c5349
3 files changed