Suggest an idea for Knip

I've noticed that sometimes a project that auto-updates Knip with Dependabot/Renovate will start warning on unused items in configs.

$ npx knip
Configuration hints
Unused item in ignoreDependencies: used-to-need-to-be-ignored-but-is-no-longer
✂️  Excellent, Knip found no issues.

But, because they're just warnings and not exit code errors, they don't fail CI. That means the PR updating Knip will get merged and these warnings will start showing up on all knip runs. I like the staying up-to-date but would really prefer to not train developers to ignore warnings in lint commands.

Proposal: could we have an option to fail on any detected unused items?

Prior art/discussion:

• https://eslint.org/docs/latest/use/command-line-interface#--max-warnings
• Enhancement: configuration option to error on unsupported TypeScript version (onUnsupportedTypeScriptVersion=error) typescript-eslint/typescript-eslint#10092