Tulio Garcia

Tested with this project [upload-problem.zip](https://github.com/vaadin/flow/files/6493659/upload-problem.zip) If the `@Bean` annotation in `RestConfiguration` is commented out, the notification is shown. Otherwise it is not. When `CommonsMultipartResolver` is registered, [streamingFinished](https://github.com/vaadin/flow/blob/59fd55ec5f0e51d10ec806c655e8dae628f00cef/flow-server/src/main/java/com/vaadin/flow/server/StreamVariable.java#L86) is never called.