tests(react): create tests for the react bindings to core (#17551)

* Add tests.

* updates after API meeting.

* test(): add tests for create controller components.

* correct testing for controller component

* Ensure tests properly cleanup after each run.

* create common test utils for overlay and controllers.

* initial tests for ion router outlet

* simple update.

* add mocks for jest tests.

react/src/index.ts

@@ -2,4 +2,4 @@ export * from './components';
 
 export * from './types';
 
-export * from './register';
+export { setupConfig } from '@ionic/core';