Improved JSON Parsing Error Handling

[yzhao244]

Improved JSON Parsing Error Handling

• File: deepeval/openai/utils.py
• Issue: json.loads(arguments) could raise JSONDecodeError if arguments string is invalid JSON
• Fix: Added try-except block to handle JSON parsing errors gracefully, falling back to empty dict or raw value

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Skipped: This PR was not opened by one of your configured authors: (tanayvaswani, trevor-cai, kritinv, ...)

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