Flaky tests on Test expert on OTP 27.3.4.1 / Elixir 1.17.3

Lots of logs of this kind alongside random failed tests:
```
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
```

I think CI doesn't like that we launch an interactive shell to find the right PATH for a project

See https://github.com/elixir-lang/expert/actions/runs/18622315176/job/53116677785