infra: refactor pytest configuration into the pyproject file

[math411]

Issue #, if available:

Description of changes:

https://docs.pytest.org/en/stable/reference/customize.html#pyproject-toml

Testing done:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (90ca196) to head (73ab44b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1040   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          135       135           
  Lines         9033      9033           
  Branches      1037      1037           
=========================================
  Hits          9033      9033           

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