fix: JSON schema union types are no longer conformed into boolean values

[edgarrmondragon]

Long due.

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📚 Documentation preview 📚: https://meltano-sdk--2723.org.readthedocs.build/en/2723/

[codspeed-hq]

CodSpeed Performance Report

Merging #2723 will not alter performance

_{Comparing 2553-bug-a-flaw-in-is_boolean_type-causes-_conform_primitive_property-to-coerce-non-boolean-fields-to-boolean (fbf60a1) with main (036d50b)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.56%. Comparing base (48fc646) to head (fbf60a1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2723   +/-   ##
=======================================
  Coverage   90.55%   90.56%           
=======================================
  Files          62       62           
  Lines        4997     5001    +4     
  Branches      637      638    +1     
=======================================
+ Hits         4525     4529    +4     
  Misses        328      328           
  Partials      144      144           

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