Merge BroadcastOptions and ActivityOptions PendingIntent BAL flags and

remove @hide

Patchset 1 is the same as ag/15884451.
The latest patchset is adding SystemAPI annotation to fix the broken test in patchset 1.

Bug: 192341120
Bug: 203407624
Test: atest BackgroundActivityLaunchTest
Change-Id: I1ac315a3268bba590406e834f4930b0cb4db5de8