[yaml] : add jinja inheritance example

[derrickaw]

fix #35930

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[gemini-code-assist]

Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new example showcasing the use of Jinja2 inheritance within Apache Beam YAML pipelines. The primary goal is to provide a clear demonstration of how to create reusable base pipelines and extend them with specific logic, enhancing modularity and reducing redundancy in pipeline definitions. This addition is fully integrated into the existing testing framework and includes comprehensive documentation.

Highlights

• New Jinja Inheritance Example: A new example demonstrating Jinja2 inheritance in Beam YAML pipelines has been added. This includes a base pipeline and a child pipeline that extends it.
• Test Integration: Existing test preprocessors have been updated to include the newly added Jinja inheritance example, ensuring its proper validation within the test suite.
• Documentation: A dedicated README file has been included to explain the Jinja inheritance example, detailing its components and providing execution instructions.

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Changelog

• sdks/python/apache_beam/yaml/examples/testing/examples_test.py
  • Updated _wordcount_jinja_test_preprocessor to include test_wordCountInheritance_yaml.
  • Updated _io_write_test_preprocessor to include test_wordCountInheritance_yaml.
  • Updated _jinja_preprocessor to include test_wordCountInheritance_yaml.
• sdks/python/apache_beam/yaml/examples/testing/input_data.py
  • Added logic to word_count_jinja_template_data to provide input data for test_wordCountInheritance_yaml.
• sdks/python/apache_beam/yaml/examples/transforms/jinja/inheritance/README.md
  • Added a new README file explaining the Jinja inheritance example, its files, and how to run it.
• sdks/python/apache_beam/yaml/examples/transforms/jinja/inheritance/base/base_pipeline.yaml
  • Added a new base YAML pipeline that defines a WordCount pipeline with an extra_steps Jinja block for extension.
• sdks/python/apache_beam/yaml/examples/transforms/jinja/inheritance/wordCountInheritance.yaml
  • Added a new child YAML pipeline that extends base_pipeline.yaml and injects a Combine transform into the extra_steps block.

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[derrickaw]

Run Python_Transforms PreCommit 3.11

[derrickaw]

Run Python_Examples PreCommit 3.11

[github-actions]

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R: @shunping for label python.

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