InputManager: Fix scenario where click can occur when ExclusiveDoubleClickMode = true

[PolygonalSun]

A user in the forum found an issue where clicks could occur ExclusiveDoubleClickMode was set to true. This PR adds a change to the logic to prevent this from happening. A test was also added to prevent this in the future.

Forum Link: https://forum.babylonjs.com/t/bug-with-babylon-scene-exclusivedoubleclickmode/38541/

[bjsplat]

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To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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