Filter out running pinned app tasks from KeyboardQuickSwitch.

- Opening KQS from keyboard shortcuts shows all the tasks.
- Opening KQS from taskbar will filter out all the running pinned apps
  from the list of views.

Bug: 368119679
Change-Id: I6090679f9fc359212db00a325917892ae6e1eb39
Test: open KQS via taskbar affordance, obseerve filtered list,
      use alt + option
      observe list changes to show all tasks
      click affordance again, observe list changes back to filtered
Flag: com.android.launcher3.taskbar_overflow