- Fixed bug where the Traefik IngressRoute generated via `reconcile` for an
  `isDefault` ringed service was pointing to a non-existent backend k8s service
  when `k8sBackend` is not provided.
  - Cause: Incorrect computed value for the IngressRoute
    `spec.routes[].services[].name`; was falling back to `metadata.name` when
    `k8sBackend` was no provided -- which did does not contain the `ringName`.
  - Fix: Expand logic for computing the IngressRoute `metadata.name`.
    1. Always compute the _ringed_ version of the service name.
    2. Use the _ringed_ service name for `metadata.name` when not `isDefault` --
       use non-ringed otherwise.
    3. Use the _ringed_ service name as fallback for the backing k8s service if
       `k8sBackend` not provided -- otherwise compute the _ringed_ `k8sBackend`.