Revert "[yaml] - Add huggingface model handler"

[derrickaw]

1. Reverts [yaml] - Add huggingface model handler #38110
2. The previous PR also made changes to build files and suspect thats whats causing the dependency resolution too deep error occurring since yesterday afternoon - https://github.com/apache/beam/actions/workflows/beam_PreCommit_Yaml_Xlang_Direct.yml

[gemini-code-assist]

Summary of Changes

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This pull request reverts the recent addition of the HuggingFace model handler in the Apache Beam YAML module. The change is intended to resolve dependency resolution issues observed in the pre-commit CI pipelines that were introduced alongside the new feature.

Highlights

• Reversion of HuggingFace Model Handler: Removed the recently added HuggingFacePipeline model handler support from the YAML ML module.
• Build Configuration Cleanup: Removed the dedicated installation task for YAML integration test dependencies and reverted the integration test tasks to use the standard GCP test installation.
• Test Suite Adjustments: Removed the HuggingFace-specific YAML test file and renamed the existing VertexAI test file.

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Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/beam_PostCommit_Yaml_Xlang_Direct.yml
  • .github/workflows/beam_PreCommit_Yaml_Xlang_Direct.yml

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Code Review

This pull request removes the HuggingFacePipeline provider from Beam YAML, deletes its corresponding integration test, and removes the installYamlIntegrationTestDeps Gradle task. The reviewer pointed out that completely removing the dependency installation task might cause other YAML integration tests to fail, as they still require the yaml and ml_test extras. It is recommended to retain the task while only excluding the problematic transformers dependency.

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sdks/python/build.gradle (127-135)

Removing the installYamlIntegrationTestDeps task entirely also removes the installation of the yaml and ml_test extras. While the transformers extra was likely the cause of the dependency resolution issues mentioned in the PR description, the remaining YAML integration tests (such as yamlIntegrationTests and postCommitYamlIntegrationTests) likely still require the yaml and ml_test extras to function correctly.

Reverting these tasks to depend only on installGcpTest may cause them to fail in CI if the yaml module or its dependencies are not included in the standard test extras. Consider keeping the helper task but removing only the transformers extra from the pip install command.

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