Add CUJ for legacy enter PiP from split screen

Add support for testing both 3 button nav and gesture nav

Test: atest FromSplitScreenAutoEnterPipOnGoToHomeTest
Test: atest FromSplitScreenEnterPipOnUserLeaveHintTest
Bug: 322394235
Flag: none, test updates

Change-Id: Ia8a5a6f80f47be6455e36558dc78bcfab720d087
3 files changed