refactor: cleanup conftest #1274

Job	Run time
linting-and-style-checks (3.9, black)	17s
unit-tests (ubuntu-20.04, 3.9, clean,py39-pytest-cov,report)	2m 31s
linting-and-style-checks (3.9, flake8)	26s
unit-tests (ubuntu-20.04, 3.9, py39-cookiecutter)	25s
linting-and-style-checks (3.9, gitlint)	21s
unit-tests (ubuntu-20.04, 3.10, clean,py310-pytest-cov,report)	2m 47s
linting-and-style-checks (3.9, isort)	15s
unit-tests (ubuntu-20.04, 3.10, py310-cookiecutter)	24s
linting-and-style-checks (3.9, mypy)	1m 2s
unit-tests (windows-latest, 3.9, clean,py39-pytest-cov,report)	2m 54s
unit-tests (windows-latest, 3.9, py39-cookiecutter)	41s
unit-tests (windows-latest, 3.10, clean,py310-pytest-cov,report)	3m 2s
unit-tests (windows-latest, 3.10, py310-cookiecutter)	55s
	16m 0s

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