[Vitest Integration] add vitest debugging guide

[edmundhung]

Summary

This adds a new Debugging guide to the Vitest integration section on how to open an inspector with Vitest and debug your Worker tests that will be introduced in cloudflare/workers-sdk#8199

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[hyperlint-ai]

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[github-actions]

Preview URL: https://e212bb92.preview.developers.cloudflare.com
Preview Branch URL: https://edmundhung-vitest-debugging-guide.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/testing/vitest-integration/debugging/	https://edmundhung-vitest-debugging-guide.preview.developers.cloudflare.com/workers/testing/vitest-integration/debugging/

[github-actions]

Howdy and thanks for contributing to our repo. We review internal PRs within 1 week. If it's something urgent or has been sitting without a comment, start a thread in the Developer Docs space internally.