Ignore editable installation modules

[GergelyKalmar]

Fixes #10230, relatively trivial change.

• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.
• Allow maintainers to push and squash when merging my commits. Please uncheck this if you prefer to squash the commits yourself.

If this change fixes an issue, please:

• Add text like closes #XYZW to the PR description and/or commits (where XYZW is the issue number). See the github docs for more information.

Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.

• Add yourself to AUTHORS in alphabetical order.

[nicoddemus]

Thanks!

Can you add a unittest for this please? There is a test in test_config.py that I think you can update.

[GergelyKalmar]

Tests are added now. Could we release it soon, if necessary as a separate patch? There will be more and more people hitting this as they're upgrading pip to newer versions.