feat(gazelle): Add ancestor conftest.py files

[thejcannon]

Why?

Fixes #3497.

Before/After

(See test changes 😛 )

[gemini-code-assist]

Summary of Changes

Hello @thejcannon, 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 significantly improves the integration of pytest with Gazelle's Python extension by enabling the automatic discovery and inclusion of conftest.py files from parent directories. This ensures that py_test rules correctly inherit shared fixtures and configurations, leading to more robust and maintainable test setups. The change addresses a previous limitation where only conftest.py files in the immediate directory were considered, streamlining the dependency management for pytest users.

Highlights

• Ancestor conftest.py Discovery: Implemented a new function, findConftestPaths, which efficiently traverses parent directories to locate all relevant conftest.py files from the current package up to a specified project root.
• Enhanced py_test Dependency Resolution: Gazelle's Python extension now automatically adds all discovered ancestor conftest.py files as dependencies for py_test rules, in addition to sibling conftest.py files.
• Bug Fix: This change resolves issue Bug/regression: Ancestor conftest inclusion #3497, addressing a limitation where py_test rules did not correctly recognize conftest.py files located in parent directories.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature to Gazelle by adding support for ancestor conftest.py files, which aligns Gazelle's behavior more closely with Pytest's discovery mechanism. The implementation is clean and effective. The new findConftestPaths function correctly traverses the directory hierarchy, and the logic in GenerateRules has been nicely refactored to incorporate this. The updated test outputs confirm the change works as expected. Overall, this is a well-executed improvement.