Fix: don't ignore the entry directory (fixes #12604)

[mysticatea]

What is the purpose of this pull request? (put an "X" next to item)

[X] Bug fix: #12604

What changes did you make? (Give an overview)

This PR fixes #12604 as unignoring the entry directory.

Previously, the eslint dir command had checked if the directly given directory (dir) is ignored by .eslintignore or not. By #12274, the ignore check has gotten to load config files from the directory that the dir exists in order to check ignorePatterns property. As a result, the eslint . command has gotten to try loading config files from ../. Then if config files were not found from ../ and ancestors, ESLint loads personal config file.

I think that it's not intuitive if the eslint . command checks the ignore of ., so this PR changes that behavior. If eslint dir is present and dir is a directory, ESLint doesn't ignore dir itself.

Actually, this change has pretty small impacts. When dir is an ignored path, it still ignores dir/** even if ESLint doesn't ignore dir itself. Therefore, the only impact is error messages ("All files matched by 'dir' are ignored" instead of "No files matching 'dir' were found") in most cases.

Is there anything you'd like reviewers to focus on?

• Is this direction right?