Add route lookup and update status.endpoint

[bshephar]

This commit adds a route lookup and then uses the returned value to update the instance.Status.Endpoint value.

❯ oc get horizon horizon -o yaml | yq .status.endpoint
horizon-openstack-operators.apps.okd.bne-shift.net

Before this change, it is defaulting to the Kubernetes service name which doesn't provide much value for the end user.

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[stuggi]

we don't want the service operators to depend on routes if possible. #224 was missing in horizon operator that the openstack-operator correct passes in the endpointURL via the override. if there is no openstack-operator, or if a loadbalancer service gets used for the public endpoints it is correct that the endpoint is a service url