Fix cloth with MeshOptimization ON

- Reexport cloth assets with AssImp ON. These was necessary because AssImp collects a different name for the color streams than FbxSDK and therefore they needed to be reassigned in the cloth rule.
- Adding '_optimized' string to a global variable and using StringFunc RChop to remove it for a string.

Gems/SceneProcessing/Code/Source/Generation/Components/MeshOptimizer/MeshOptimizerComponent.cpp

@@ -54,6 +54,7 @@
 #include <SceneAPI/SceneCore/Events/GenerateEventContext.h>
 #include <SceneAPI/SceneCore/Events/ProcessingResult.h>
 #include <SceneAPI/SceneCore/Utilities/Reporting.h>
+#include <SceneAPI/SceneCore/Utilities/SceneGraphSelector.h>
 #include <SceneAPI/SceneData/GraphData/BlendShapeData.h>
 #include <SceneAPI/SceneData/GraphData/MeshData.h>
 #include <SceneAPI/SceneData/GraphData/MeshVertexBitangentData.h>
@@ -280,8 +281,7 @@ namespace AZ::SceneGenerationComponents
                 }
 
                 const AZStd::string name =
-                    AZStd::string(graph.GetNodeName(nodeIndex).GetName(), graph.GetNodeName(nodeIndex).GetNameLength())
-                    + "_optimized";
+                    AZStd::string(graph.GetNodeName(nodeIndex).GetName(), graph.GetNodeName(nodeIndex).GetNameLength()).append(SceneAPI::Utilities::OptimizedMeshSuffix);
                 if (graph.Find(name).IsValid())
                 {
                     AZ_TracePrintf(AZ::SceneAPI::Utilities::LogWindow, "Optimized mesh already exists at '%s', there must be multiple mesh groups that have selected this mesh. Skipping the additional ones.", name.c_str());