Auto scroll edit mode grid when dragging to edges

Also adds a drag type to differentiate between dragging a current tile vs a new tile.
This is used to automatically scroll the grid to the top only when dragging a new tile.

Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Fixes: 380847714
Test: manually dragging tiles in edit mode
Change-Id: I8b78cb4b72d1ce3a9e82c4cd2170b297e9f17ad4