Use Playwright `webServer` option

[jtpio]

References

Use Playwright webServer option to start the web server automatically: https://playwright.dev/docs/test-configuration#launching-a-development-web-server-during-the-tests

Code changes

• [x] Playwright config update. This means we can remove the use of the ifaxity/wait-on-action@v1 GitHub Action.
• [x] Bump some GitHub Actions to remove Node.js 12 warnings

User-facing changes

None

Backwards-incompatible changes

None

[jtpio]

Looking good on the report:

[trungleduc]

Thanks @jtpio