consolidate pytest config in pyproject.toml

[jameslamb]

fixes #6194

Wheel tests in this project are emitting tons of warnings like this:

test_random_forest.py:1247
/__w/cuml/cuml/python/cuml/cuml/tests/test_random_forest.py:1247: PytestUnknownMarkWarning: Unknown pytest.mark.memleak - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
@pytest.mark.memleak

I think that's because the introduction of a pytest.ini file in #6078 resulted in all of the pytest options from pyproject.toml being ignored.

From https://docs.pytest.org/en/stable/reference/customize.html#pytest-ini

pytest.ini files take precedence over other files, even when empty.

I think "take precedence" there means that if pytest finds a pytest.ini, it stops searching for other configuration files.

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[jameslamb]

/ok to test

[betatim]

Thanks for taking the time to figure this out and then fix it straight away.

Looks good to me.

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Annoying that we can't add a pytest.ini with a warning for people from the future to not use it :-/

[jameslamb]

Annoying that we can't add a pytest.ini with a warning for people from the future to not use it :-/

@betatim we could add pytest.ini to .gitignore with a comment! Want me to do that?

[betatim]

Good idea!

[jameslamb]

Thanks for considering it! @betatim I just pushed that change, will you take a look and let me know what you think?

I intentionally am leaving python/cuml/cuml/benchmark/automated/pytest.ini because I don't know exactly how it's used in this repo.

[betatim]

I intentionally am leaving python/cuml/cuml/benchmark/automated/pytest.ini because I don't know exactly how it's used in this repo.

I also don't know exactly what it does/when it is used. But the robots (aka CI) seem happy with it in place so I'd also leave it alone for now.

[jameslamb]

This is blocked by the error reported in #6206, which will hopefully be fixed by #6207