[bugfix] Ignore field when descriptor does not have filed from fieldsToRead in protobuf codegen decoder

[rseetham]

bugfix: In ProtobufCodegenDecoder, to generate the decoder code, during schema update, we might have a case where the input descriptor does not have the FieldDescriptor yet but the column is in the schema. In that case, we will not read that field in. This fix is to make sure the code gen does not fail in such a case

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.23%. Comparing base (59551e4) to head (54894b1).
Report is 471 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13186      +/-   ##
============================================
+ Coverage     61.75%   62.23%   +0.48%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2529      +93     
  Lines        133233   138222    +4989     
  Branches      20636    21389     +753     
============================================
+ Hits          82274    86024    +3750     
- Misses        44911    45780     +869     
- Partials       6048     6418     +370     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	62.20% <100.00%> (+0.49%)	⬆️
java-21	62.12% <100.00%> (+0.49%)	⬆️
skip-bytebuffers-false	62.22% <100.00%> (+0.47%)	⬆️
skip-bytebuffers-true	62.10% <100.00%> (+34.37%)	⬆️
temurin	62.23% <100.00%> (+0.48%)	⬆️
unittests	62.23% <100.00%> (+0.48%)	⬆️
unittests1	46.72% <ø> (-0.17%)	⬇️
unittests2	27.92% <100.00%> (+0.18%)	⬆️

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