Correct activity's lifecycle when the process was killed in background.

The lifecycle of an invisible activity would stay in pause stage if
it's process was died and restore from attachApplication. The incorrect
status can affect transition since it won't be removed from
UnknownAppVisibilityController. Stopping the invisible activity so it
won't stay in paused.

Bug: 327596503
Test: atest RecentsAnimationTest
Test: launch a translucent app, entering keyguard, kill home process.
Verify the activity of home process would be stopped after attach the
process back.

Change-Id: I80756609fe643877971408934b19ad97aa0ae746
Merged-In: I80756609fe643877971408934b19ad97aa0ae746