ATOM-14040 Add Support for Cavity Maps
Replace the "Ambient Occlusion" property groups with "Occlusion" property groups that contain settings for "Diffuse AO" and "Specular Cavity" maps.
Pre-multiplied diffuseAmbientOcclusion into the m_albedo.rgb gbuffer, making room for specularOcclusion to be stored in m_albedo.a
Added new render pipeline connections to connect the albedo gbuffer to the fullscreen reflection passes.
Also fixed ATOM-15297 "StandardPBR_ForwardPass.shadervariantlist Job Fails With Obscure Error"
Chris Santora
43b7a42a0b