Revert "Update iceberg to 1.9.2"

[ahmedabu98]

Reverts #35981 and #36092

[gemini-code-assist]

Summary of Changes

Hello @ahmedabu98, 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 aims to stabilize the project by reverting a recent dependency upgrade that introduced compatibility challenges. It specifically downgrades the Apache Iceberg dependency and restores Java 8 support for a critical component. The changes also involve a significant restructuring of the codebase, integrating previously separate modules directly into their parent projects to simplify maintenance and improve overall consistency.

Highlights

• Iceberg Version Downgrade: This pull request reverts the Apache Iceberg dependency from version 1.9.2 back to 1.6.1, addressing potential compatibility issues introduced by the newer version.
• Java 8 Compatibility Restoration: Java 8 support for the Beam IO expansion service has been re-enabled. The previous upgrade to Iceberg 1.9.2 had dropped this support, which is now restored.
• Module Consolidation and Refactoring: Dedicated Gradle modules for Iceberg examples (examples/java/iceberg) and the SQL extension (sdks/java/extensions/sql:iceberg) have been removed. Their contents, including examples and core SQL extension components, have been moved and integrated directly into the general examples/java and sdks/java/extensions/sql modules, respectively. This streamlines the project structure.

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[chamikaramj]

LGTM.

[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

[Amar3tto]

Should we also cherrypick this to release-2.68 ?

[chamikaramj]

This shouldn't be needed since we have a workaround in #36108.