text: Title: tox 4 ignores TOX_SKIP_ENV
  Body: ## Issue
  
  My `make release` for [gitlab-trace](https://github.com/mgedmin/gitlab-trace) runs `TOX_SKIP_ENV=check-manifest tox -p auto`.  This worked with tox 3.x.  It now fails in tox 4, because it doesn't skip the check-manifest toxenv.
  
  Since the documentation page describing the TOX_SKIP_ENV has 'latest' in the URL (https://tox.wiki/en/latest/config.html#envlist), I think it should still be supported?
  
  ## Environment
  
  Provide at least:
  
  - OS: Ubuntu 22.10
  - `pip list` of the host Python where `tox` is installed:
  
  ```console
  $ pipx runpip tox list
  Package       Version
  ------------- -------
  cachetools    5.2.0
  chardet       5.1.0
  colorama      0.4.6
  distlib       0.3.6
  filelock      3.8.2
  packaging     22.0
  pip           22.3.1
  platformdirs  2.6.0
  pluggy        1.0.0
  py            1.11.0
  pyparsing     3.0.9
  pyproject_api 1.2.1
  setuptools    65.6.3
  six           1.16.0
  toml          0.10.2
  tomli         2.0.1
  tox           4.0.2
  virtualenv    20.17.1
  wheel         0.38.4
  ```
  
  <!-- do I need these?
  ## Output of running tox
  
  Provide the output of `tox -rvv`:
  
  ```console
  
  ```
  
  ## Minimal example
  
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  ```console
  
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