fix tests. new product advisories enhancements

src/Scanner/__Libraries/StellaOps.Scanner.Analyzers.Lang/Core/LanguageAnalyzerResult.cs

@@ -91,6 +91,12 @@ public sealed class LanguageComponentWriter
         _builder = builder ?? throw new ArgumentNullException(nameof(builder));
     }
 
+    /// <summary>
+    /// Creates a writer for testing purposes. Components added to this writer will be discarded.
+    /// </summary>
+    public static LanguageComponentWriter CreateNull()
+        => new(new LanguageAnalyzerResultBuilder());
+
     public void Add(LanguageComponentRecord record)
         => _builder.Add(record);