[Dataflow Streaming] Enable state tag encoding v2

[arunpandianp]

No description provided.

[arunpandianp]

R: @scwhittle

[gemini-code-assist]

Summary of Changes

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This pull request enables state tag encoding v2 by default for new Dataflow Streaming Engine jobs in the Java SDK. This change improves state handling efficiency but introduces specific compatibility requirements for job updates and version downgrades, which are now documented in the project changelog.

Highlights

• State Tag Encoding v2: Enabled state tag encoding v2 by default for new Dataflow Streaming Engine jobs.
• Pipeline Configuration: Added the ability to disable the new encoding via the --experiments=disable_streaming_engine_state_tag_encoding_v2 pipeline option.
• Documentation: Updated CHANGES.md to reflect the new feature and associated constraints regarding job updates and version compatibility.

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[gemini-code-assist]

Code Review

This pull request enables state tag encoding v2 by default for new Dataflow Streaming Engine jobs in the Java SDK and documents this change in the release notes. A review comment points out that we should avoid adding the enable_streaming_engine_state_tag_encoding_v2 experiment if the user has explicitly disabled it via disable_streaming_engine_state_tag_encoding_v2 to prevent sending conflicting experiments to the Dataflow backend.

[github-actions]

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[scwhittle]

I think we should respect the update compatability beam option as well, if that is requesting a lower version it should not enable this so that update compatability with the older version works. see updateCompatibilityVersionLessThan