Refactor `lib/__tests__/ignoreDisables.test.js` (#5283)
Refactor `lib/__tests__/ignoreDisables.test.js` (#5283)

This change aims to improve the test code readability via async/await syntax.
(avoiding callbacks as much possible)

See also <jestjs.io/docs/asynchronous>
stylelint/stylelint,stylelint/stylelint,stylelint/stylelint,stylelint/stylelint