fix: execption when invalid config has circular references

[jcubic]

Prerequisites checklist

• I have read the contributing guidelines.

AI acknowledgment

• I did not use AI to generate this PR.
• (If the above is not checked) I have reviewed the AI-generated content before submitting. (used AI to generate the unit test)

What is the purpose of this pull request?

This PR fixes the exception from circular data when handling invalid config error

What changes did you make? (Give an overview)

replaced: JSON.stringify with util.inspect.

Related Issues

• Bug: Converting circular structure to JSON when showing config error eslint#20237

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jcubic / name: Jakub Jankiewicz (f5d79bc)

[lumirlumir]

Since eslint/eslint#20237 has not yet been accepted, I’m marking this PR as a draft to prevent it from being merged accidentally.

[github-actions]

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[github-actions]

Hi everyone, it looks like we lost track of this pull request. Please review and see what the next steps are. This pull request will auto-close in 7 days without an update.