Fix Recommendations AI catalog outputs and sklearn pins for 3.14

[aIbrahiim]

Fixes recent postcommit failures:
https://github.com/apache/beam/actions/runs/23945045340/job/69839310689
https://github.com/apache/beam/actions/runs/23927135099/job/69786245559

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Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses recent post-commit failures by refining the Recommendations AI catalog item creation process and updating dependency constraints. The changes introduce a more robust output handling mechanism for the CreateCatalogItem transform, enabling better error tracking, and adjust scikit-learn version pins to maintain compatibility with upcoming Python versions.

Highlights

• Recommendations AI Catalog Outputs: Updated the CreateCatalogItem transform to support multi-output PCollections, allowing for the explicit handling of both successful and failed catalog item creations.
• Dependency Management: Updated scikit-learn version pinning in the examples requirements file to ensure compatibility with Python 3.14.
• Test Suite Updates: Refactored unit and integration tests to accommodate the new multi-output structure of the CreateCatalogItem transform.

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[aIbrahiim]

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[github-actions]

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R: @shunping for label python.

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[aIbrahiim]

@Abacn