Chore icu 15637 upgrade ember test helpers (#2545)

* Upgrade ember-test helpers

* Upgrade ember-int and ember-cli-clipboard, as ember-test-helpers introduces a breaking change

addons/api/package.json

@@ -39,7 +39,7 @@
     "@babel/plugin-proposal-decorators": "^7.21.0",
     "@ember/optional-features": "^2.0.0",
     "@ember/string": "^3.0.1",
-    "@ember/test-helpers": "^3.3.1",
+    "@ember/test-helpers": "^4.0.4",
     "@embroider/test-setup": "^2.1.1",
     "@faker-js/faker": "^8.0.2",
     "@glimmer/component": "^1.1.2",