Cherry picking AddFile large batch improvement

[ahmedabu98]

CP for #38039

[ahmedabu98]

R: @chamikaramj
R: @Amar3tto

[gemini-code-assist]

Summary of Changes

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This pull request refactors the Iceberg AddFiles transform to improve how data files are committed to Iceberg tables. Instead of committing individual data files directly, the process now groups data files into manifests, which are then committed as a batch. This change improves performance and scalability, particularly for large streaming pipelines. Additionally, the PR simplifies configuration parameters and removes a resource-intensive validation step for bucket partitions.

Highlights

• Refactored Manifest Creation: Updated the Iceberg AddFiles transform to group data files into manifests before committing, improving scalability and performance.
• Configuration Changes: Replaced 'appendBatchSize' with 'manifestFileSize' to better reflect the new manifest-based commit strategy.
• Removed Resource-Intensive Validation: Removed the in-depth bucket-partition validation logic, as it was too resource-intensive and inconsistent with other implementations.

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