Prevent scrollbar to be considered as a drop target for drag-and-drop

[manixate]

Fixes: #48929

The approach here is to prevent scrollbar to be not considered a drop target when searching on dragover or dragleave. This behaviour is similar to how MacOS handles drag and drop while hovering on the scrollbar in Finder.

Another approach is basically to add drop event listener on the domNode instead of wrapper which will allow the user to drop any item on the scrollbar but the file will be dropped on the top level of the folder structure instead of in the scrolled position.

Let me know if you want another approach instead of the one in this PR.

[joaomoreno]

Thanks! 🍻