Revert "remove playground annotations from BatchElementsExample "

[aIbrahiim]

Reverts #38733

[gemini-code-assist]

Summary of Changes

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This pull request reverts a previous change that removed metadata annotations from the BatchElementsExample class. The restoration ensures that the example remains correctly configured for the Beam Playground environment.

Highlights

• Restoration of Playground Annotations: Re-added the necessary Beam Playground configuration annotations to the BatchElementsExample class, which were previously removed.

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[gemini-code-assist]

Code Review

This pull request adds metadata comments to the BatchElementsExample.java file to support the beam-playground configuration. I have no further feedback to provide.

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[github-actions]

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R: @chamikaramj for label java.

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