fix(sdk): preserve required body properties in flat params signatures

[vcombey]

Summary

Fix flattened body requiredness in SDK signatures when using paramsStructure: 'flat'.

Closes #3455.

Problem

For object request bodies, flattened properties were marked required by checking property.required, which is not valid at property level in OpenAPI schema objects.

OpenAPI requiredness for object properties is defined by the parent schema required array. A property schema does not have its own required flag.

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Latest commit: f482160

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.37%. Comparing base (11f5470) to head (f482160).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3456      +/-   ##
==========================================
+ Coverage   40.11%   40.37%   +0.25%     
==========================================
  Files         478      478              
  Lines       17488    17489       +1     
  Branches     5294     5301       +7     
==========================================
+ Hits         7016     7061      +45     
+ Misses       8425     8392      -33     
+ Partials     2047     2036      -11     

Flag	Coverage Δ
unittests	40.37% <100.00%> (+0.25%)	⬆️

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