Use proto descriptor for typename

[jackgerrits]

Closes #5302

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.16%. Comparing base (6454e3f) to head (1c4ac25).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5346      +/-   ##
==========================================
+ Coverage   76.15%   76.16%   +0.01%     
==========================================
  Files         158      158              
  Lines        9497     9502       +5     
==========================================
+ Hits         7232     7237       +5     
  Misses       2265     2265              

Flag	Coverage Δ
unittests	76.16% <100.00%> (+0.01%)	⬆️

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