Fix pointerId leak when a pen is lifted off the digitizer #16156
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When a pen is lifted off the digitizer, beyond the range of the digitizer to detect it, the pointerleave event is raised. This fix listens to that event, and the pointer is a pen, it calls into the existing logic to cancel a touch operation.
This addresses the issue reported here in the forum: https://forum.babylonjs.com/t/onpointerobservable-ignoring-tablet-pen-input/56405