FIx yaml doc generation

[Abacn]

Fix #34694

Re-generated doc in apache/beam-site#706

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[gemini-code-assist]

Summary of Changes

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This pull request improves the YAML documentation generation process by refactoring the dependency management for expansion services. By creating a dedicated task to prepare and cache these services, the build process becomes more robust and maintainable. Additionally, it cleans up unused configuration properties in the standard YAML definitions.

Highlights

• YAML Documentation Generation: Introduced a new Gradle task 'prepareExpansionServicesForYamlDocs' to centralize the building and caching of expansion services required for YAML documentation generation.
• Configuration Cleanup: Removed the 'append_batch_size' property from the standard YAML configuration definition.

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[gemini-code-assist]

Code Review

This pull request removes the append_batch_size property from standard_io.yaml and introduces a new Gradle task, prepareExpansionServicesForYamlDocs, to build and cache expansion service JARs. A critical issue was identified in the Gradle copy task where passing task path strings directly to the from method will not resolve to the task's output files, resulting in no files being copied. It is recommended to use project.tasks.findByPath(...) to correctly reference the tasks and copy their outputs.

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[Abacn]

R: @jrmccluskey @derrickaw

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