fix(mongodb): update filter composition to handle MongoDB 5.x driver

[liferoad]

Modify filter composition logic to avoid $and wrapping when possible by merging conditions directly into a composite Document. This addresses behavior changes in MongoDB driver 5.x while maintaining backward compatibility.

Fixes #35514

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[gemini-code-assist]

Summary of Changes

Hello @liferoad, 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 a compatibility issue with MongoDB driver 5.x in Apache Beam's SQL extension. It refines the filter composition logic to prevent unnecessary $and wrapping by directly merging conditions into a composite Document, ensuring correct behavior while maintaining backward compatibility for various filter types.

Highlights

• MongoDB Filter Optimization: The constructPredicate method in MongoDbTable.java has been updated to create a composite filter by merging individual conditions directly into a Document when possible.
• MongoDB Driver 5.x Compatibility: This change specifically resolves behavioral differences introduced in MongoDB driver 5.x by avoiding explicit $and operators for simple conjunctions.
• Backward Compatibility: A fallback mechanism is implemented where Filters.and() is still used if the individual filter components are not Document instances, ensuring compatibility with existing filter structures.

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