add new header exclusion

Author: jaydeluca

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/parsers/SpanParser.java

@@ -25,7 +25,7 @@ public class SpanParser {
 
   // We want to ignore test related attributes
   private static final List<String> EXCLUDED_ATTRIBUTES =
-      List.of("x-test-", "test-baggage-", "test_message");
+      List.of("x-test-", "test-baggage-", "test_message", "Test_Message");
 
   /**
    * Pull spans from the `.telemetry` directory, filter them by scope, and set them in the module.