chore: replace all usages of removed ClassUtils macros

src/ZoneCodeGeneratorLib/Utils/NamespaceBuilder.h

@@ -1,7 +1,5 @@
 #pragma once
 
-#include "Utils/ClassUtils.h"
-
 #include <string>
 #include <vector>
 
@@ -12,7 +10,7 @@ class NamespaceBuilder
 public:
     static std::string Combine(const std::string& _namespace, const std::string& name);
 
-    _NODISCARD bool IsEmpty() const;
+    [[nodiscard]] bool IsEmpty() const;
     void Push(std::string element);
     void Pop();
     std::string ToString();