Use proto descriptor for typename

[jackgerrits]

Closes #5302

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.04%. Comparing base (e8f49ef) to head (c48d1aa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5346      +/-   ##
==========================================
+ Coverage   76.02%   76.04%   +0.01%     
==========================================
  Files         157      157              
  Lines        9491     9496       +5     
==========================================
+ Hits         7216     7221       +5     
  Misses       2275     2275              

Flag	Coverage Δ
unittests	76.04% <100.00%> (+0.01%)	⬆️

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