[WP]test: #5555 migrate from tap to node:test

[JohnMikko27]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[JohnMikko27]

Hi, I'm new to contributing to Fastify and saw the discussion fastify #5555 about migrating from tap to node:test. I made a PR but it's still a work in progress as I just wanted to make sure that what I've done so far is fine. Please let me know, thank you for your time.

[Eomm]

Thanks for opening this PR - the first step was good indeed but the changes were a lot.

I would suggest to start with a smaller issue like this one: #316 where we can support you in a smaller use case

Superseded by #367