test: make test-http-outgoing-proto agnostic

Do not check the error message if it is generated by the JavaScript
engine (V8, ChakraCore, etc.). Do confirm that it is a `TypeError`.

PR-URL: #16272
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: Trott

test/parallel/test-http-outgoing-proto.js

@@ -96,11 +96,14 @@ assert.throws(() => {
   message: 'The first argument must be one of type string or buffer'
 }));
 
-// addTrailers
+// addTrailers()
+// The `Error` comes from the JavaScript engine so confirm that it is a
+// `TypeError` but do not check the message. It will be different in different
+// JavaScript engines.
 assert.throws(() => {
   const outgoingMessage = new OutgoingMessage();
   outgoingMessage.addTrailers();
-}, /^TypeError: Cannot convert undefined or null to object$/);
+}, TypeError);
 
 assert.throws(() => {
   const outgoingMessage = new OutgoingMessage();