add unit-tests to regression pipeline

[pdabelf5]

Proposed changes

• add unit tests to regression pipeline to ensure report is uploaded to codecov.io
• refactor unit-test/coverage make targets

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.24%. Comparing base (8a2c9a9) to head (b5bb1dd).
Report is 565 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6152      +/-   ##
==========================================
- Coverage   52.32%   43.24%   -9.08%     
==========================================
  Files          61      142      +81     
  Lines       17502    19970    +2468     
==========================================
- Hits         9158     8637     -521     
- Misses       8015    10884    +2869     
- Partials      329      449     +120     

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