E2E: Cross-platform support for Playwright E2E tests

[t-hamano]

Fix: #39721, #40352

What?

This PR ensures that cross-platform valid absolute path strings are generated in configuration file path definitions.

Why?

In testDir and globalSetup, new URL().pathname is used to set the path, but it generates an invalid path string on some platforms.

How?

I followed the node documentation and wrapped new URL().href with url.fileURLToPath to generate a platform independent path.

The writing may be a little tricky, so please advise if you have a better solution.

Testing Instructions

• npm run test-e2e:playwright
• One test should run correctly as follows:

> playwright test --config test/e2e/playwright.config.ts

Running 1 test using 1 worker

  ✓  [chromium] › sanity.spec.js:8:2 › Sanity check › Expect site loaded (6s)


  1 passed (13s)

[kevin940726]

Nice catch! Thanks for fixing this! 🧡