Notify launch app over lockscreen to keyguard transition handler.

Provide a short term workaround for shell transition, let Keyguard
service notify KeyguardTransitionHandler that there has created a
remote transition request for next launch app transition, so the
transition doesn't needs to be handled by KeyguardTransitionHandler.

Bug: 297859920
Test: launch app from Keyguard, verify the KeyguardTransitionHandler
can handle that open-app transition.

Change-Id: If146900a0411a532679e930ca4e317cb1b7a7969