chore: exclude generated protobuf files from coverage report

[gruebel]

This PR

• just making sure our coverage is not as bad as codecov tells us 😄

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.55%. Comparing base (d8e10c7) to head (777d577).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files           8        8           
  Lines         180      180           
=======================================
  Hits          163      163           
  Misses         17       17           

Flag	Coverage Δ
unittests	90.55% <ø> (ø)

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