Don't alter any InputElement properties from in-process dnd handler #18288
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Our initial implementation of in-process drag-n-drop was altering the cursor of the control under the pointer and reverting it back after the drag operation was done. This didn't account for the other code potentially changing said cursor on the same element in the meantime.
This PR introduces an internal cursor override API for TopLevel that stores the temporary cursor in a field and uses it while the override is active.