Update distutils patch to monkeypatch all paths from sys.path to ensure that distutils is never imported except from the same path as setuptools. Assert that 'distutils' is not already in sys.modules.

Run docs build as part of CI

Moved distutils' doc for setup-keywords into our doc to document all supported keywords

Support attr directive with static evaluation

Fix an RST link typo in the dev guide

📝 Document setup.cfg-only possibilities

Reuse @ack_2to3 in TestDevelop.test_2to3_user_mode

Feature/faster distribution hashcmp no remove

Remove the test, no longer relevant now that external links are no longer supported and PyPI no longer allows replacing packages.

Fixes #2107