fix(toolkits): Move results iteration inside try block for better exception handling

[coolbeevip]

Description

Refactor results iteration to ensure exception safety in search_duckduckgo

Fixes #3341

Checklist

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• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• I have updated the tests accordingly (required for a bug fix or a new feature)
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• I have added examples if this is a new feature

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch issue-3341

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[Wendong-Fan]

thanks @coolbeevip !