Clean Jest config

* remove the UI library source from the module mapping, it is expected to run build before test instead
* remove different node_module overrides
* add WP i18n to the module mapping to ensure a singleton, this fixes the text-domain warnings

packages/js/jest.config.js

@@ -20,13 +20,11 @@ module.exports = {
  "find-with-regex": "<rootDir>/node_modules/find-with-regex/lib/index.js",
  "^lodash-es$": "lodash",
  "^lodash-es/(.*)$": "lodash/$1",
- "@yoast/ui-library": "<rootDir>/../ui-library/src",
+ "@wordpress/i18n": [
+ "<rootDir>node_modules/@wordpress/i18n",
+ "<rootDir>/../../node_modules/@wordpress/i18n",
+ ],
  },
- moduleDirectories: [
- "<rootDir>/node_modules",
- "<rootDir>/../../node_modules",
- "node_modules",
- ],
  collectCoverageFrom: [
  "src/**/*.{js,jsx,ts,tsx}",
  ],