Fix Playwright workflow to fetch base branch for PR comparison#640

Copilot wants to merge 1 commit intomaingooglemaps-samples/js-api-samples:mainfrom

copilot/fix-f67dae01-3635-44b5-ad05-5a18dc4d9f92googlemaps-samples/js-api-samples:copilot/fix-f67dae01-3635-44b5-ad05-5a18dc4d9f92Copy head branch name to clipboard