Use new testRuleConfigs function of jest-preset-stylelint

[ybiquitous]

Which issue, if any, is this issue related to?

Ref stylelint/jest-preset-stylelint#68

Is there anything in the PR that needs further explanation?

Note that this PR uses the unpublished version of jest-preset-stylelint.
The new version is out! https://github.com/stylelint/jest-preset-stylelint/releases/tag/6.2.0

[jeddy3]

LGTM, thank you.

Is the intent to add this to other rules or keep it in our back pocket to use when fixing a bug with the option validation of a rule?

[ybiquitous]

Is the intent to add this to other rules or keep it in our back pocket to use when fixing a bug with the option validation of a rule?

I think the latter now. But adding this to other rules may be good when we have time. 👍🏼