Is your enhancement related to a problem? Please describe.

We needed to make some changes to have linting passing on #4039, but we should revisit it to fix things properly.

• Remove --warning-severity=6 from the lint.yml GH Action
• Remove the at-rule-disallowed-list override in .stylelintrc

Designs

No response

Describe alternatives you've considered

No response

Code of Conduct

• I agree to follow this project's Code of Conduct