Suppress compiler warnings in auto-generated code (#6474)

Co-authored-by: Glen <[email protected]>

Author: VaclavSir

src/HotChocolate/Core/src/Types.Analyzers/Helpers/CodeWriterExtensions.cs

@@ -31,6 +31,7 @@ public static void WriteFileHeader(this CodeWriter writer)
         writer.WriteIndentedLine("// <auto-generated/>");
         writer.WriteLine();
         writer.WriteIndentedLine("#nullable enable");
+        writer.WriteIndentedLine("#pragma warning disable");
         writer.WriteLine();
         writer.WriteIndentedLine("using System;");
         writer.WriteIndentedLine("using System.Runtime.CompilerServices;");