Fix Build Issues with Iceberg Upgrade

[tarun-google]

Adding gradle task to run Iceberg examples. Issue created with recent refactoring #35981

copied gradle task from examples/java

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[gemini-code-assist]

Summary of Changes

Hello @tarun-google, 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 build issues encountered when running Iceberg examples by introducing a new Gradle task for easier execution and explicitly managing a critical dependency. The changes ensure that Iceberg examples can be built and run correctly within the Beam repository, specifically by resolving an Avro version conflict required by Iceberg.

Highlights

• New Gradle Execute Task: A new Gradle execute task has been added to simplify running individual Iceberg examples directly within the Beam repository, allowing for dynamic runner configuration.
• Avro Dependency Resolution: The org.apache.avro:avro dependency is now explicitly forced to version 1.12.0 to resolve compatibility issues required by Iceberg-core.

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[tarun-google]

/gemini review

[gemini-code-assist]

Code Review

This pull request addresses build issues related to an Iceberg upgrade. It introduces a dependency override for Avro to ensure compatibility and adds a convenient execute Gradle task to run Iceberg examples. The changes look good, but I have a couple of suggestions to make the new execute task more robust and idiomatic.

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[tarun-google]

Run Java_Examples_Dataflow_Java21 PreCommit

[github-actions]

Assigning reviewers:

R: @m-trieu for label java.

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[Abacn]

Thanks!