test: use destructuring and remove unused arguments

Use destructuring consistently and remove unused function arguments in
test-pipewrap.js

PR-URL: #24375
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/async-hooks/test-pipewrap.js

@@ -8,7 +8,7 @@ const assert = require('assert');
 const tick = require('../common/tick');
 const initHooks = require('./init-hooks');
 const { checkInvocations } = require('./hook-checks');
-const spawn = require('child_process').spawn;
+const { spawn } = require('child_process');
 
 if (!common.isMainThread)
   common.skip('Worker bootstrapping works differently -> different async IDs');
@@ -45,7 +45,7 @@ checkInvocations(processwrap, { init: 1 },
   checkInvocations(x, { init: 1 }, 'pipe wrap when sleep.spawn was called');
 });
 
-function onsleepExit(code) {
+function onsleepExit() {
   checkInvocations(processwrap, { init: 1, before: 1 },
                    'processwrap while in onsleepExit callback');
 }