Add active test to ForegroundModeTest

Rename ForegroundModeTest to ForegroundModeAndActiveTest. Add a test to
verify that op start references persist across UID Mode changes

Test: atest ForegroundModeAndActiveTest
Bug: 208662370
Change-Id: Id76902a0ad40855b93571341ea9ed38c34dddcf8
Merged-In: Id76902a0ad40855b93571341ea9ed38c34dddcf8
1 file changed