Fix ActivityOptions.makeTaskLaunchBehind() doesn't work

- Activity tasks shouldn’t be moved to top if we were launching
  the activity in behind.

- Activities were temporarily set as visible if it was actively
  launched behind. Ensure the activities visibilities to avoid
  keeping activities in RESUMED state after finish animating.

- Fix black screen flashes while starting task-behind.
  The top app was set to hidden while starting an activity behind,
  even when it was on top and actually visible. So, black screen
  shown after reparenting the app token to leash for transition
  animation because the leash was also hidden since it was created
  from a hidden app.

Bug: 123382216
Test: atest StartActivityTests
Change-Id: I3cba33d7a0ce2d08d43a08e97f919bdd7bb21d7c