infra: refactor pytest configuration into the pyproject file

[AbeCoull]

Issue #, if available:

Description of changes:

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

Testing done:

Merge Checklist

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (ecdf4d9) to head (f53c16a). Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1040   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files          135       135           
  Lines         9058      9058           
  Branches      1043      1043           
=========================================
  Hits          9058      9058           

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