Build/Test Tools: Don’t install Playwright browsers in 5.8 branch.

This makes use of the new input added in [60005] that allows older branches to skip Playwright related steps.

Merges [60006] to the 5.8 branch.
Fixes #63117.

git-svn-id: https://develop.svn.wordpress.org/branches/5.8@60012 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/end-to-end-tests.yml

@@ -49,6 +49,7 @@ jobs:
       LOCAL_SCRIPT_DEBUG: ${{ matrix.LOCAL_SCRIPT_DEBUG }}
       php-version: '8.0'
       install-gutenberg: false
+      install-playwright: false
 
   slack-notifications:
     name: Slack Notifications