WICKET-5499 Page is not touched during initialization

This is a partial revert of d86d9afa8fc5d21d0d5a1c70e0fcd780ace6e3e6 - don't mark the page as stateful when passed to RenderPageRequestHandler because this breaks the submits of stateless forms

(cherry picked from commit 93fb6eb29ee0da6d7e884250c4b5a5f1e72800d9)