ci/simplify coverage

[gnikit]

• ci: simplify coverage step
• refactor(ci): move unit test execution past linting

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.73%. Comparing base (2723a1c) to head (d338b67).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
+ Coverage   87.66%   87.73%   +0.06%     
==========================================
  Files          35       35              
  Lines        4793     4793              
==========================================
+ Hits         4202     4205       +3     
+ Misses        591      588       -3     

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