iter8: `iter8ctl describe` does not work if caller does not have cluster wide permission

Describe the bug iter8ctl describe should retrieve details of the latest experiment. However, it relies on cluster wide access so if a user has restricted access, the command fails.

To Reproduce Observed in CIL environment where one is logged in as user.

$ iter8ctl describe
Error: experiments.iter8.tools is forbidden: User "IAM#cil1" cannot list resource "experiments" in API group "iter8.tools" at the cluster scope

Even restricted to a valid namespace, this fails:

$ iter8ctl describe -n staging-kalantar---us-ibm-com
Error: experiments.iter8.tools is forbidden: User "IAM#cil1" cannot list resource "experiments" in API group "iter8.tools" at the cluster scope

Even specifying the experiment is insufficient:

$ iter8ctl describe hello-experiment -n staging-kalantar---us-ibm-com
Error: experiments.iter8.tools is forbidden: User "IAM#cil1" cannot list resource "experiments" in API group "iter8.tools" at the cluster scope

Expected behavior Should work even when role/rolebinding restricts access to single namespace. Suggest always look only in specified (-n option) or default namespace.

Kubernetes environment (please provide the following information): Observed in CIL environment. Not sure how to reproduce in local clluster.

Additional context Add any other context about the problem here.