SETUPTOOLS_USE_DISTUTILS=local is not tested by CI infrastructure

[mkoeppe]

setuptools version

any

Python version

any

OS

any

Additional environment information

No response

Description

There is no testing of the vendored distutils that are activated by SETUPTOOLS_USE_DISTUTILS=local.

Expected behavior

The vendored distutils, currently again only used when SETUPTOOLS_USE_DISTUTILS=local is set, should be checked by tox and GH Actions workflows.

How to Reproduce

$ git grep -l SETUPTOOLS_USE_DISTUTILS

Output

$ git grep -l SETUPTOOLS_USE_DISTUTILS
CHANGES.rst
_distutils_hack/__init__.py
docs/deprecated/distutils-legacy.rst
setup.py
setuptools/tests/test_distutils_adoption.py

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