fix: disable warnings in auto-generated code (#3163)

Author: thomhurst

TUnit.Core.SourceGenerator/Generators/DataSourceHelpersGenerator.cs

@@ -73,6 +73,7 @@ private static void GenerateIndividualDataSourceHelper(SourceProductionContext c
         var sb = new StringBuilder();
 
         sb.AppendLine("// <auto-generated />");
+        sb.AppendLine("#pragma warning disable");
         sb.AppendLine("using System;");
         sb.AppendLine("using System.Runtime.CompilerServices;");
         sb.AppendLine("using System.Threading.Tasks;");