🧪 test: add missing edge case test for recursive_sort with empty arrays

[ffalcinelli]

🎯 What: The missing edge case test for recursive_sort handling an empty array.
📊 Coverage: Empty arrays provided directly to recursive_sort and empty arrays nested within objects are now covered to ensure they remain unchanged without errors.
✨ Result: Improved test coverage for utils::recursive_sort preventing future regressions regarding empty structures.

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PR created automatically by Jules for task 2533503813893468590 started by @ffalcinelli

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.75%. Comparing base (de9ea2a) to head (8b2e182).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   89.75%   89.75%           
=======================================
  Files          38       38           
  Lines        2489     2489           
=======================================
  Hits         2234     2234           
  Misses        255      255           

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