*: http_routing
When rewriting the webclient, a new environment was created, as well as
a new type of service and a new mechanism to start those services. This
environment and the services that go with it were not made available in
the frontend however.
This commit adapts the setup code for the frontend's root widget (and
the website specific equivalent, WebsiteRoot) so that the new
environment exists, and some of the calls to the legacy services are
redirected to the new services. The point is to allow removing some
legacy services whose code is currently only needed by the frontent
because of the lack of availability of this new env and services
Part of #72675
Samuel Degueldre
db7b485d98