fix(listview): [Android] Fix drag-to-reorder not applying

Fix bug where drag-to-reorder would sometimes not be applied if item was dragged quickly, specifically in the case were the timing of events runs DragOver (pointer moved) -> Drop (pointer up) -> measure+arrange.

src/Uno.UI/UI/Xaml/Controls/ListViewBase/VirtualizingPanelLayout.Android.cs

@@ -2127,6 +2127,10 @@ internal void UpdateReorderingItem(Windows.Foundation.Point location, FrameworkE
 
 		internal Uno.UI.IndexPath? CompleteReorderingItem(FrameworkElement element, object item)
 		{
+			// Ensure that _pendingReorder.index is set. This is necessary in case it was invalidated from UpdateReorderingItem() but the
+			// list was not yet remeasured, which can happen when dragging rapidly.
+			GetAndUpdateReorderingIndex();
+
 			var updatedIndex = default(Uno.UI.IndexPath?);
 			if (_pendingReorder?.index is { } index)
 			{