python: fix bazel py_test testSmoke for Python 3.11+ #20738
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The test was failing because the `b.py` file couldn't be imported because, starting with Python 3.11, the `PYTHONSAFEPATH` environment variable (set by the bootstrap startup) is respected. This setting inhibits the default Python behavior of adding the main script's directory to sys.path. To fix, use `py_library.imports` to explicitly add the necessary directory to `sys.path`. Fixes bazelbuild#20660
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The test was failing because the
b.pyfile couldn't be imported because, starting with Python 3.11, thePYTHONSAFEPATHenvironment variable (set by the bootstrap startup) is respected. This setting inhibits the default Python behavior of adding the main script's directory to sys.path.To fix, use
py_library.importsto explicitly add the necessary directory tosys.path.Fixes #20660