Fix: Remove _cleanup() calls from unit test after() hooks to prevent 5s timeout

- _cleanup() has 10s timeout but Mocha tests have 5s timeout
- _afterSuite() already stops the browser properly
- Global after() hook handles final process exit
- Fixes 8 failing unit tests with 'Timeout of 5000ms exceeded' errors

Author: kobenguyent

test/helper/Playwright_test.js

@@ -82,7 +82,6 @@ describe('Playwright', function () {
 
   after(async () => {
     await I._afterSuite()
-    await I._cleanup()
   })
 
   describe('open page : #amOnPage', () => {
@@ -1695,8 +1694,6 @@ describe('Playwright - Performance Metrics', () => {
 
   after(async () => {
     await I._afterSuite()
-    // Use the built-in cleanup method
-    await I._cleanup()
   })
 })