fix: Add VLM support for Docling and improve deps

[erichare]

This pull request enhances the file processing pipeline by adding support for vision-language models, improving error handling in file loading, and updating dependencies to enable advanced OCR and image processing features.

Pipeline and Processing Enhancements:

• Added a new "vlm" (vision-language model) pipeline option in the create_converter function, allowing files to be processed using vision-language model strategies in addition to the existing standard pipeline. This supports more advanced document understanding workflows.
• Improved error handling in load_files_advanced and load_files_markdown to raise clear exceptions if no content is generated or if errors are present, ensuring more robust downstream processing.

Dependency Updates:

• Added easyocr and opencv-python to the dependencies in pyproject.toml to support advanced OCR and image processing capabilities.

Project Metadata:

• Updated the code_hash in the Document Q&A starter project metadata to reflect the latest changes.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-vlm-docling

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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