Reorder fullscreen task to top in moveToFullscreen

- Even in desktop first environments we want to reorder the top task
  we're moving to in fullscreen to top. Otherwise we cannot switch to
  existing fullscreen tasks that are not at the top while currently in
  desktop session.

Flag: com.android.launcher3.enable_alt_tab_kqs_flatenning
Bug: 382769617
Test: manually run CUJ
Change-Id: If85d955159f346c9210f457f7efe90435f3652de