WebDeviceInputSystem: Add additional checks for pointermove started Touch events

[PolygonalSun]

A user in the forum found a particular edge case where pointermove events were inconsistently interacting with a scene where pointer capture was being programmatically set. Because this worked with 4.2.x, this behavior was seen as a regression. This PR adds some additional checks to the touch code to more properly handle this scenario.

Forum Link: https://forum.babylonjs.com/t/pointer-capture-failing-for-babylon-pointer-observable-during-a-scroll-event/43253/7

[bjsplat]

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[bjsplat]

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