fix(eslint-config-carbon): move best-practices back to cjs module export (#18377)

Co-authored-by: Taylor Jones <tay1orjones@users.noreply.github.com>

Author: matthewgallo

config/eslint-config-carbon/rules/best-practices.js

@@ -7,7 +7,7 @@
 
 'use strict';
 
-export default {
+module.exports = {
   rules: {
     // @see https://eslint.org/docs/rules/curly
     curly: 'error',