[GUI] Block pointer events to scene when pointer is captured #12400
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When a pointer is captured (for example, if the user is dragging a scrollbar), pointer events should not be passed to the scene.
This matches the behavior of setPointerCapture() on the web, which forces all pointer events to fire on a particular element.
Resolves forum issue: https://forum.babylonjs.com/t/scrollbar-and-pointerblocker/28732
See playground: #XNY77K#3