Can we move to the Node Test Runner?

[fershad]

Is your feature request related to a problem? Please describe.
This project currently uses Jest for writing tests. This still works, but it does mean that there's one more development dependency we need to think about. Ideally, we'd like to remove as many external dependencies as possible to simplify the project and also reduce our risk to vulnerabilities/attacks in external packages.

Describe the solution you'd like
Node has a native Test Runner. Could we switch to that, or would that mean we'd be limited to only testing our code against the latest version of Node?

Describe alternatives you've considered
We could also look at Vitest, which is a very nice alternative to Jest. However, that still means we'd be using an external library for testing & doesn't feel like it would be worth the effort to switch to.