When a page endpoint triggers a normalization redirect or follows a wiki-page redirect, it must keep any query parameters from the original request intact.

For example, /page/Foo%20Bar/html?flavor=edit should redirect to /page/Foo_Bar/html?flavor=edit, and /page/Foo%20Bar/html?redirect=no should redirect to /page/Foo_Bar/html?redirect=no.

This can be realized by plumbing query parameters through to the calls to getRoutUrl() in PageRedirectHandlerTrait. We can get them directly from $this->getRequest()->getQueryParams(), there is no need to loop them through as parameters.