ListView dnd testing followups (#3181)
* fixing listview dnd issues with disabled rows and selected items removed from the collection
fixes an issue where disabled rows were focusable via screen reader when in a drag session. Also fixes an issue where drag and drop events would contain all selected keys even if said keys dont exist in the draggable collection
* calculating isFocused in useEffect in case manager.focusedKey is updated in a side effect
fixes case where the wrong key is focused after dropping into a list. useDroppableCollection updates focused key in a useLayoutEffect which causes the render calculated isFocused in useSelectableItem to be out of date and causes the wrong item to get focused
* adding test for focusing the dropped item
* attempting to fix build on 16/17
* minimum amount of await run all timer calls
* updating to clear promise queue
* adding tab index check
