Use non-linear mapping for ReflectionProbe mip levels to match sky #96426
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Fixes: #85299
This is the same change from #69514 and it should have been applied to ReflectionProbes at that time.
This change isn't needed for the compatibility renderer because it uses a linear mapping of perceptual roughness to mipmap levels
Scene from the MRP (with roughness layers disabled for sky so the quality matches exactly)
Sky reflection
Probe reflection