refactor: 💡 implement new pathing for auth methods

addons/api/addon/adapters/auth-method.js

@@ -0,0 +1,13 @@
+import ApplicationAdapter from './application';
+
+export default class AuthMethodAdapter extends ApplicationAdapter {
+
+  // =attributes
+
+  /**
+   * Auth methods use the new, unprefixed pathing style.
+   * @override
+   */
+  hasScopePrefix = false;
+
+}