Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[x] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

Fix #18536

/*eslint no-restricted-imports: ["error", { patterns: [{
    "importNamePattern": "_Enum$",
    "regexGroup": "@app/(?!(api/enums$)).*"
}]}]*/

// error
import { Foo_Enum } from '@app/api';
import { Bar_Enum } from '@app/api/bar';
import { Baz_Enum } from '@app/api/baz';
import { B_Enum } from '@app/api/enums/foo';

// no error
import { C_Enum } from '@app/api/enums';

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

Earlier group was a required property in the schema and would throw an error if not defined, which isn't the case anymore as we need either group or regexGroup.