Fixes for node palette exclusion, restrict asset variable type to fix LYN-3090

Gems/ScriptCanvas/Code/Include/ScriptCanvas/SystemComponent.h

@@ -22,6 +22,7 @@
 #include <ScriptCanvas/Core/ScriptCanvasBus.h>
 #include <ScriptCanvas/Variable/VariableCore.h>
 #include <ScriptCanvas/PerformanceTracker.h>
+#include <ScriptCanvas/Data/DataRegistry.h>
 
 namespace AZ
 {
@@ -65,6 +66,8 @@ namespace ScriptCanvas
 
         inline bool IsAnyScriptInterpreted() const { return true; }
 
+        AZStd::pair<DataRegistry::Createability, TypeProperties> GetCreatibility(AZ::SerializeContext* serializeContext, AZ::BehaviorClass* behaviorClass);
+
         // SystemRequestBus::Handler...
         bool IsScriptUnitTestingInProgress() override;
         void MarkScriptUnitTestBegin() override;