Disable PendingIntent background activity launch

Set BroadcastOptions to explicitly disallow the receiver from
starting activities, to prevent apps from utilizing the
PendingIntent as a backdoor to do this.

Bug: 230866011
Test: Test with PoC app to verify app does not be launched
Test: atest FrameworksNetTests
Ignore-AOSP-First: security patch
Change-Id: Ie795d5c40a3fa2d8f30c1d0f6530be554ececb61