query params without controller declaration works when it shouldn't

Repro:

1. Set the following in the `index` route:

```js
// app/routes/index.js
queryParams: {
test: { refreshModel: true }
}
```

1. In a sibling route, access using `paramsFor`:

```js
// app/routes/foo.js
setupController() {
this.set('myQp', this.paramsFor('index').test);
}
```
1. Visit the app at `localhost:4200/foo?test=something`
1. See that the the `foo` template has `myQp` successfully set.

The issue is that query params have not officially been declared on any controller, so they're accessible everywhere? This is sort of unexpected behavior and I'm not sure what the "correct" behavior is, but it's worth investigating and possibly making more strict?

Here's a repro with Ember 3.11: https://github.com/mehulkar/ember-example-qp-no-declare

and the diff that has the chunk of what is described above: https://github.com/mehulkar/ember-example-qp-no-declare/commit/89240104e52bb7e388848ac55027b8acdaab4ba3