[yaml]: fix provider testing issue

[derrickaw]

Apparently testing framework doesn't support providers. Adding support.

470235428

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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 addresses a critical limitation in the YAML testing framework by introducing comprehensive support for custom providers. Previously, the framework could not properly interpret or utilize user-defined transforms specified as providers within the YAML pipeline. The changes refactor the pipeline specification loading and processing, enabling the system to parse and integrate these custom providers, thereby significantly enhancing the flexibility and testability of YAML-based pipelines by allowing custom logic to be tested directly.

Highlights

• Provider Support in Testing: The YAML testing framework now fully supports custom providers defined within the pipeline specification, allowing for more flexible and comprehensive testing of user-defined transforms.
• Enhanced Robustness: The json_config_schema method in yaml_provider.py has been made more robust by gracefully handling cases where a transform's config_schema might be absent, defaulting to an empty dictionary instead of raising an error.
• Refactored Pipeline Specification Handling: The run_test function in yaml_testing.py has been refactored to ensure consistent processing of pipeline specifications, whether provided as a string or a dictionary, before injecting test transforms and applying options.
• New Test Case: A new test, test_toplevel_providers, has been added to yaml_testing_test.py to validate the functionality of defining and utilizing custom providers (like 'MyDoubler') directly within the YAML test pipeline.

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R: @tvalentyn for label python.

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