fix(config_file): allow directories in _path_validator

[mdevolde]

fix(config_file): allow directories in _path_validator

Why the pull request was made

Because directories are not allowed for config values that are path, which is problematic for config values like languageModel.

Summary of changes

• Allow directories in config_file._path_validator

Screenshots (if appropriate):

Not applicable.

How has this been tested?

Tested with concerned config values.

Resources

Not applicable.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to documentation only)
• Refactor / code style update (non-breaking change that improves code structure or readability)
• Tests / CI improvement (adding or updating tests or CI configuration only)
• Other (please describe):

Checklist

• Followed the project's contributing guidelines.
• Updated any relevant tests.
• Updated any relevant documentation.
• Added comments to your code where necessary.
• Formatted your code, run the linters, checked types and tests.