test: refactor parallel/test-tls-cert-chains-concat

Added common.mustCall and replaced function with arrow function.

PR-URL: #19096
Fixes: #14544
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

Author: juggernaut451

test/parallel/test-tls-cert-chains-concat.js

@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 const fixtures = require('../common/fixtures');
 
 // Check cert chain is received by client, and is completed with the ca cert
@@ -19,7 +19,7 @@ connect({
     cert: keys.agent6.cert,
     key: keys.agent6.key,
   },
-}, function(err, pair, cleanup) {
+}, common.mustCall((err, pair, cleanup) => {
   assert.ifError(err);
 
   const peer = pair.client.conn.getPeerCertificate();
@@ -47,4 +47,4 @@ connect({
   assert.deepStrictEqual(pair.server.conn.getPeerCertificate(true), {});
 
   return cleanup();
-});
+}));