🧪 Add testing for float parsing error paths

[edithatogo]

🎯 What: Added tests to cover the missing error path tests for float parsing in _safe_float from public_source_transforms.py.
📊 Coverage: Covered both the happy path (valid float parsing strings) and the error paths (ValueError for invalid strings, TypeError for None), verifying that it returns None as expected.
✨ Result: Improved test coverage around string-to-float data transformations, increasing the reliability of parsing logic against dirty input.

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PR created automatically by Jules for task 6431751598469947280 started by @edithatogo

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[amazon-q-developer]

The test additions for _safe_float are well-structured and provide comprehensive coverage of both the happy path (valid float parsing) and error paths (ValueError for invalid strings, TypeError for None). The tests correctly verify that the function returns None for all error cases as expected. The changes improve test coverage without introducing any defects.

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