Allow apps that are currently instrumenting with background activity

starts privileges to start activities from background

Test: atest WmTests:ActivityStarterTests
Test: atest google/perf/jank/SystemUI/UbSystemUIJankTests
Test: atest LightBarTests
Test: atest CtsActivityManagerDeviceTestCases
Bug: 123434182
Bug: 110956953
Bug: 122760822
Change-Id: I66dc700bcb4713838528094a35337bcb3770d229