Build/Test Tools: Reinstate PUPPETEER_SKIP_DOWNLOAD for most CI workflows.

The `PUPPETEER_SKIP_DOWNLOAD` environment variable is used to prevent Puppeteer from automatically downloading browser binaries.
It was removed in [56926] due to the migration to Playwright. However, because of the QUnit tests, Puppeteer is actually still a dependency.

Until those tests change, we have to keep this environment variable to prevent unnecessary downloads on CI.

Props SergeyBiryukov.
Fixes #59517.

git-svn-id: https://develop.svn.wordpress.org/trunk@56954 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/coding-standards.yml

@@ -142,6 +142,8 @@ jobs:
       contents: read
     timeout-minutes: 20
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
+    env:
+      PUPPETEER_SKIP_DOWNLOAD: ${{ true }}
 
     steps:
       - name: Checkout repository