Enhancement: Make a cvar for disable occlusion player for volumetric lighting

[kiddu25]

What would this enhancement be for?

Rendering

Describe your enhancement suggestion in more detail

https://github.com/user-attachments/assets/b7af4d2f-ac1a-4c03-ad7a-85e2790928d6
As you can see in certain situation, it's make really weird resultat to player, there should be a cvar to disable it
(probably disable it by default?)