switch to newIncreamentalChangelogScan

[derrickaw]

We either need to revert #38836 or possibly go with this fix due to issue with BaseIncrementalChangelogScan not being visible.

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[derrickaw]

Looks like IcebergIO Unit tests is permared - https://github.com/apache/beam/actions/runs/29097919253

and Precommit Java

https://github.com/apache/beam/actions/runs/29103300426/job/86397380646

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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 updates the Iceberg changelog scanning logic in the Beam SDK to utilize the newly available public API. By switching to the official table.newIncrementalChangelogScan() method, the implementation becomes more robust and aligns with standard Iceberg library usage patterns.

Highlights

• API Migration: Replaced the manual instantiation of BaseIncrementalChangelogScan with the official table.newIncrementalChangelogScan() API.
• Code Cleanup: Removed the now-obsolete import of BaseIncrementalChangelogScan and the associated TODO comment.

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Code Review

This pull request updates ChangelogScanner.java to use the official table.newIncrementalChangelogScan() method instead of manually instantiating BaseIncrementalChangelogScan, which resolves a temporary TODO comment and removes an unused import. There are no review comments, and I have no feedback to provide.

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