Fix python-augeas failure on Windows (v2) (#8951)

This PR is a new approach for fixing #8732 based on the discussions occurred in the first PR #8877.

This PR upgrades python-augeas to the latest version, and avoids tests failure of Windows because of this upgrade. To do so it leverages the [tox multi-platform feature](https://tox.readthedocs.io/en/latest/example/platform.html) and modifications to `tools/venv.py` in order to not install and not test `certbot-apache` on Windows.

* Unpin python-augeas and upgrade current pinnings

* Do not install certbot-apache in Windows dev environments

* Introduce tox specific win packages + remove certbot compatibility on windows

* Add libaugeas to sphinx build

* Redefine lint and mypy targets

* Keep the lint and mypy environments

tools/pinning/current/pyproject.toml

@@ -73,12 +73,6 @@ pip = "20.2.4"
 # here in addition to certbot/setup.py because otherwise the pre-release
 # version of poetry will not be installed.
 poetry = ">=1.2.0a1"
-# We were originally pinning back python-augeas for certbot-auto because we
-# found the way older versions of the library linked to Augeas were more
-# reliable. That's no longer a concern, however, we continue to pin back the
-# library for now because it causes Certbot tests on Windows to fail. See
-# https://github.com/certbot/certbot/issues/8732.
-python-augeas = "0.5.0"
 # Because some parts of Certbot documentation are generated from zope.interfaces,
 # we need the Sphinx plugin repoze.sphinx.autointerface. This plugin is not
 # currently compatible with Sphinx>=4 though so we're pinning an older version