Seriously look into nextest

[DavisVaughan]

https://nexte.st/

I did a POC locally and was very impressed

We have had a long history of having to deal with tests that rely on global state. Since cargo test runs them in parallel within the same process, we often need some painful locking mechanisms which are annoying for us to manage.

The big selling point of nextest is that it is fast while giving each test its own process
https://nexte.st/docs/design/why-process-per-test/

That seems like it would work perfectly for us, so we should seriously look into this, and if it works well consider backporting to ark, as it might help with stability issues there