Reparent recents animation task leash to app animation layer

- When swiping up in split screen, the task is clipped by the unminimized
  stack bounds, instead reparent to app animation layer to allow it to be
  unconstrained. Currently, this will bump it up to the top, but we need
  a mechanism later to bump it only to under the primary splitscreen stack.

Bug: 73118672
Test: Swipe up from split screen, ensure app window is not clipped
Change-Id: Iacc6d6b82274b8b26b2dab85628479b5ff490817