Fix Python PostCommit Dependency: centralize Vertex AI test skip

[aIbrahiim]

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Summary of Changes

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This pull request refactors how Vertex AI integration tests are skipped when their dependencies are not met. By centralizing the skip logic into a dedicated module and applying it at the class level, the change improves the maintainability and consistency of the test suite, ensuring that tests requiring Vertex AI are only run when the environment is properly configured.

Highlights

• Centralized Vertex AI Test Skipping: Introduced a new utility module vertex_ai_skip.py to centralize the logic for conditionally skipping Vertex AI integration tests when the necessary dependencies are not available.
• Refactored Test Decorators: Applied the new @skip_if_vertex_ai_disabled decorator to relevant Vertex AI test classes, ensuring tests are skipped consistently if the Vertex AI SDK is missing. This also involved moving the @pytest.mark.vertex_ai_postcommit decorator from individual test methods to the class level for better organization.
• Improved Test Dependency Management: Streamlined the handling of optional Vertex AI dependencies in tests, making the test suite more robust and easier to manage across different environments.

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Changelog

• sdks/python/apache_beam/ml/inference/vertex_ai_inference_it_test.py
  • Imported skip_if_vertex_ai_disabled from the new utility module.
  • Applied @skip_if_vertex_ai_disabled and @pytest.mark.vertex_ai_postcommit to the VertexAIInference test class.
  • Removed redundant @pytest.mark.vertex_ai_postcommit decorators from individual test methods within the class.
• sdks/python/apache_beam/ml/transforms/embeddings/vertex_ai_test.py
  • Imported pytest and skip_if_vertex_ai_disabled.
  • Applied @skip_if_vertex_ai_disabled and @pytest.mark.vertex_ai_postcommit to VertexAIEmbeddingsTest and VertexAIMultiModalEmbeddings test classes.
• sdks/python/apache_beam/testing/vertex_ai_skip.py
  • Added a new file to define _is_vertex_ai_available function to check for Vertex AI client dependencies.
  • Introduced skip_if_vertex_ai_disabled as a pytest.mark.skipif decorator based on the availability of Vertex AI dependencies.

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