Refactor SQL result comparison in execute_sql & iterate_execute_sql to use normalized, sort…

[AmanBhattShorthillsAI]

…ed tuples

• Replaced set-based comparison with normalization and sorting of result tuples.
• This approach preserves duplicate rows, handles mixed data types, and is order-insensitive for both columns and rows.
• Improves accuracy of SQL result comparison for evaluation.

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