Provide easy way to configure fluffy SSO and RBAC service endpoints

[Isan-Rivkin]

We currently configure the chart to use local service names fluffy-sso and fluffy-rbac.
In some cases users need a way to use FQDN (i.e ..svc.cluster.local) or in general case, set a different value value.
Currently it is possible by passing additional environment variables but the Ingress resource is not overridable.
Same goes for the readiness and liveness probes.
So the only option would be to use an our of chart Ingress resource which is not nice.