🧪 [testing improvement] Add test for extract_secrets edge cases

[ffalcinelli]

🎯 What: Added tests for missing edge cases in extract_secrets (null, bool, number, string, empty object, empty array).
📊 Coverage: The test ensures that extract_secrets handles primitive types and empty JSON structures without panicking and accurately leaves the secrets map unmodified.
✨ Result: Improved test coverage and reliability of the secret extraction logic for edge-case JSON inputs.

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PR created automatically by Jules for task 1060335708594297893 started by @ffalcinelli

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.04%. Comparing base (7739b86) to head (44a1ef8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files          27       27           
  Lines        2199     2199           
=======================================
  Hits         2024     2024           
  Misses        175      175           

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