Revert "Update transform catalogue docs"

[aIbrahiim]

Reverts #38457 to unblock Playground CI

The added BatchElementsExample uses org.apache.beam.sdk.transforms.BatchElements which is only available on upcoming release so we will add it back after the release.

[gemini-code-assist]

Summary of Changes

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This pull request reverts the recent addition of the BatchElements transform documentation and example code. The change is necessary to unblock the Playground CI, as the underlying transform functionality is currently only available in an upcoming release. Additionally, minor code cleanup was performed within the BatchElements implementation to improve maintainability.

Highlights

• Reversion of BatchElements documentation: Removed the BatchElements example and associated documentation to unblock the Playground CI, as the feature relies on an upcoming release.
• Code cleanup in BatchElements: Simplified the BatchElements transform implementation by removing unused imports and updating the output method to use outputWithTimestamp.

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[gemini-code-assist]

Code Review

This pull request simplifies the BatchElements transform in the Java SDK by replacing receiver.outputWindowedValue with receiver.outputWithTimestamp and removing unused imports. It also removes the BatchElements example, documentation, and website menu references. There are no review comments, so I have no feedback to provide.

[aIbrahiim]

cc: @damccorm @Abacn @ganesh-skumar

[damccorm]

Instead of reverting the whole PR, can we just remove the example which is causing the failures (or maybe even just the playground portion)? Then we can unrevert it after the next release

[Abacn]

Minimun change need to bring playground ci test green would be remove the playground annotations for now

https://github.com/aIbrahiim/beam/blob/0302bf5529cda834cfabed642e6e8e5373d5a65f/examples/java/src/main/java/org/apache/beam/examples/BatchElementsExample.java#L32