Do not start auto-pip transition when swiping from split

Also, pass a PictureInPictureSurfaceTransaction to hide the tasks in
split-screen from Launcher to WM to avoid flicker when any one of the
tasks enters PiP.

Bug: 190855091
Bug: 205894095
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/42RWtayanp2qG0mHSf4Q5
Test: manual, enter PiP from split-screen, see Video
Change-Id: Ia8b6243c0d95c2be8007beeefa2083acc856e404