Stop spamming "Hardware not supported for Volumetric Materials" error

Report from this discussions thread : https://discussions.unity.com/t/hdrp-should-stop-spamming-the-hardware-not-supported-for-volumetric-materials-error/1705949

Steps to reproduce:

1. Open a HDRP project with fog on hardware that doesn't support 

   SystemInfo.supportsRenderTargetArrayIndexFromVertexShader 

Actual results: 

The error “Hardware not supported for Volumetric Materials” is logged every frame.

Expected results: 

Emit the error once and disable Volumetric Materials rendering.

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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