Summary of Changes

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This pull request addresses a performance bottleneck in Bazel builds related to Python virtual environment (venv) creation. It optimizes the process of materializing venv files by consolidating numerous individual symlink actions into a more efficient runfiles mechanism. This change aims to reduce the total number of actions Bazel needs to perform, leading to faster and more streamlined builds, particularly for projects with extensive Python dependencies.

Highlights

• Performance Optimization: The pull request introduces a significant performance improvement by changing how virtual environment (venv) symlinks are created. Instead of generating many individual symlink actions, they are now batched into a runfiles object, which is expected to reduce the overall action count in Bazel builds.
• Refactored Venv Symlink Handling: The create_venv_app_files function has been refactored to return a structured object containing both direct venv files and a map of symlinks specifically intended for runfiles. This separation allows for more efficient processing of file-based symlinks.
• Integration with Executable Creation: The _create_venv function now consumes the newly structured output from create_venv_app_files, specifically utilizing the runfiles_symlinks to merge them into the executable's runfiles, ensuring all necessary dependencies are correctly linked for runtime.

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