Preserve file permissions when extracting runfiles zip In Python rules, the Python stub script is responsible for extracting the runfiles from the zip file when --build_python_zip is used. However, there's a bug in the standard Python library (https://bugs.python.org/issue15795) that causes file permissions to be lost when extracting zips. This causes runfiles to not be marked executable, which is a problem when the py_runtime is an in-build runtime (issue #5104). This change updates the stub script to workaround the bug by directly chmodding extracted files with their intended mode. It also adds a regression test combining a custom py_runtime with --build_python_zip. Fixes #5104, unblocks #7375. RELNOTES: Fixed an issue where some `py_runtime`s were incompatible with using `--build_python_zip` (#5104). PiperOrigin-RevId: 246195931
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