Switch from `esmock` to Node.js `MockTracker`

[PierreDemailly]

We introduced esmock when we were still using v16-v18 and when the native mock api were in development. Now the MockTracker should be enough and simpler.

[PierreDemailly]

Or if we want to go further: remove all mocks 😅

[albertshay888]

@all-contributors please add @albertshay888 for good first issue, tests

[allcontributors]

@albertshay888

I've put up a pull request to add @albertshay888! 🎉