See:

- https://lab.nexedi.com/nexedi/nxdtest
- https://lab.nexedi.com/nexedi/nxdtest/blob/master/nxdtest/__init__.py
- nexedi/nxdtest@d575236a
- nexedi/slapos!839

-> Leave only .nxdtest file with neotest-specific bits to be run by
nxdtest driver.