Hide generated source files from clang-tidy

[greenc-FNAL]

• CXX_CLANG_TIDY is a target property
• Avoid generated dictionary code being examined with clang-tidy

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #471      +/-   ##
==========================================
+ Coverage   85.42%   85.53%   +0.11%     
==========================================
  Files         144      144              
  Lines        3589     3589              
  Branches      615      615              
==========================================
+ Hits         3066     3070       +4     
+ Misses        313      312       -1     
+ Partials      210      207       -3     

Flag	Coverage Δ
unittests	85.53% <ø> (+0.11%)	⬆️

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see 4 files with indirect coverage changes

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