Only switch to 10% app on single tap

* Ignore drags and long presses on offscreen app
* Necessary for not falsing taps when dragging down status bar when in immersive mode.

Bug: 383626044
Test: Only single taps expand
Flag: com.android.wm.shell.enable_flexible_two_app_split
Change-Id: Ifc440152424cd0687ef7da3f9cba937e2e106b82