fix(ci): revise playwright install for CI

[puckowski]

• Revise Playwright install method for CI to avoid browser binary mismatch issues.

What:

Try to resolve CI issues where version of Playwright installed by CI on the fly would differ from package.json definition and cause browser binary mismatches.

Issue manifests like so:

╔═════════════════════════════════════════════════════════════════════════╗
║ Looks like Playwright Test or Playwright was just installed or updated. ║
║ Please run the following command to download new browsers:              ║
║                                                                         ║
║     pnpm exec playwright install                                        ║
║                                                                         ║
║ <3 Playwright Team                                                      ║
╚═════════════════════════════════════════════════════════════════════════╝

Why:

CI should be as reliable as possible.

Checklist:

• Documentation
• Added/updated unit tests
• Code complete

[puckowski]

Tried variations of

pnpm exec playwright install chromium --with-deps

and

pnpm add -D @playwright/test

but the only solution that seems to work is pinning the version of Playwright installed to match package.json.