[ci] remove 'test_suite' in setup.py

[jameslamb]

Changes

• removes unnecessary argument test_suite in setuptools.setup() in setup.py

How I tested this

docker run \
  --rm \
  --entrypoint="" \
  -v "$(pwd)":/opt/testing \
  --workdir /opt/testing \
  --env TASK=tests \
  -it circleci/python:3.9 \
  /bin/bash -c '.ci/setup.sh && .ci/test.sh'

Saw that test collection succeeded and all tests ran successfully.

===== 355 passed, 1 warning in 4.87s ====

Notes

This project uses pytest directly, and doesn't need any of the configuration for python setup.py test.

This change reduces the risk of hamilton packaging and installation failing on future versions of setuptools which remove python setup.py test support completely.

See relate PR #89 for links to documentation on ongoing changes to setuptools.

Thanks for your time and consideration.

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

LGTM. Thanks @jameslamb