Cherry picking AddFile large batch improvement

[ahmedabu98]

CP for #38039

[gemini-code-assist]

Summary of Changes

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This pull request introduces a significant architectural improvement to the Iceberg AddFiles transform by shifting from direct file commits to a manifest-based approach. By grouping data files into manifests before committing, the pipeline becomes more efficient and scalable. Additionally, the change simplifies configuration by focusing on manifest file size and removes heavy validation logic that was previously causing performance bottlenecks.

Highlights

• Manifest-based Commit Strategy: Refactored the AddFiles transform to group data files into manifests before committing to Iceberg, improving scalability and performance.
• Configuration Changes: Replaced 'appendBatchSize' with 'manifestFileSize' to better reflect the new manifest-based batching logic.
• Removed Resource-Intensive Validation: Removed the in-depth bucket-partition validation logic, as it was too resource-intensive and inconsistent with other implementations like Spark.
• Dependency Updates: Updated Dataflow container versions to 2.73.0.

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