ATOM-15133 "Clean Up EnhancedPBR"

Updated material type files for StandardPBR, EnhancedPBR, and Skin to align with each other as much as possible.
There were minor cases like some property settings were different, properties in different order, comments, and formatting.
There were major cases as well, like EnhancedPBR using clunky built in functors where lua functors would be better, property visibility state wasn't right, properties were missing, etc.

I also added a new HasShaderWithTag function for lua functors. This is used in StandardPBR_ShaderEnable.lua to allow this script to be used for both StandardPBR and EnhancedPBR (EnhancedPBR doesn't have the low end pipeline shaders).

Gems/Atom/RPI/Code/Source/RPI.Reflect/Material/LuaMaterialFunctor.cpp

@@ -296,6 +296,7 @@ namespace AZ
                 ->Method("GetShaderCount", &LuaMaterialFunctorRuntimeContext::GetShaderCount)
                 ->Method("GetShader", &LuaMaterialFunctorRuntimeContext::GetShader)
                 ->Method("GetShaderByTag", &LuaMaterialFunctorRuntimeContext::GetShaderByTag)
+                ->Method("HasShaderWithTag", &LuaMaterialFunctorRuntimeContext::HasShaderWithTag)
                 ;
         }
 
@@ -424,6 +425,11 @@ namespace AZ
                 return LuaMaterialFunctorShaderItem{nullptr};
             }
         }
+        
+        bool LuaMaterialFunctorRuntimeContext::HasShaderWithTag(const char* shaderTag)
+        {
+            return m_runtimeContextImpl->m_shaderCollection->HasShaderTag(AZ::Name{shaderTag});
+        }
 
         void LuaMaterialFunctorEditorContext::LuaMaterialFunctorEditorContext::Reflect(BehaviorContext* behaviorContext)
         {