feat: Adds Playwright testing.

[willum070]

This change adds Playwright testing to ensure that all samples build without error, and load properly. It loops through the samples, builds and runs locally using Vite. Tests check for the following conditions:

• No build errors.
• No console errors.
• google is loaded on the page.
• The map locator is visible.

Notes:

• Chromium is currently the only browser tests run on. Currently that should be fine since our primary goal is detecting broken samples rather than determining intra-browser issues.
• The visibility check on the map locator will need to be updated to accommodate samples that don't use a page locator for the map.