fix(iceberg): prevent premature FileIO closure in RecordWriter

[liferoad]

Keep FileIO open for writer lifetime to avoid connection pool shutdown issues Add test to verify FileIO remains open until writer close

Fixes #36438

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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 an issue in the Iceberg integration where the FileIO was being closed prematurely, leading to connection pool shutdown errors. The changes ensure that FileIO remains open for the writer's lifetime and includes a test to verify the fix. Additionally, the changes improve exception handling during the close operation.

Highlights

• FileIO Closure: Prevents premature FileIO closure in RecordWriter to avoid connection pool shutdown issues, specifically addressing a problem where the underlying client pools (e.g., S3) were being prematurely shut down, leading to "Connection pool shut down" errors.
• Writer Lifetime: Keeps FileIO open for the entire lifetime of the writer to ensure that connections remain active until the writer is completely closed.
• Test Verification: Adds a test case to verify that FileIO remains open until the writer is closed, ensuring the fix is effective and preventing regressions.
• Exception Handling: Improves exception handling during the close operation, ensuring that any exceptions thrown during FileIO.close() are properly caught and handled, including adding suppressed exceptions to the main close error.

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[liferoad]

@ahmedabu98 does this make sense to keep it open?

[github-actions]

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R: @m-trieu for label java.

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