chore: move pytest configs to pyproject.toml

[Bento007]

Reason for Change

• moving pytest run configuration for unit tests into pyproject.toml. This is easier to maintain that in a makefile.

Changes

• moving pytest run configuration for unit tests into pyproject.toml
• update coverage/run to use testpaths from pyproject.toml

Testing steps

• verify coverage works and unit tests work for each test suite.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.62%. Comparing base (27b8bb2) to head (59c2f9f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   84.62%   84.62%           
=======================================
  Files          19       19           
  Lines         969      969           
  Branches      186      186           
=======================================
  Hits          820      820           
  Misses        139      139           
  Partials       10       10           

Flag	Coverage Δ
unittests	84.62% <ø> (ø)

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