Need to test and handle workloadRef

[gnunn1]

Right now this UI has only been tested when the rollout includes the pod template, however the rollout can also reference a workloadRef in Deployments, Replicasets, etc and there are some changes in behavior required when this done.

For example, a rollback needs to replace the template in the dependent object rather then in the rollout as per this code here:

https://github.com/argoproj/argo-rollouts/blob/master/pkg/kubectl-argo-rollouts/cmd/undo/undo.go#L117

There are likely other places where this will cause issues.

[gnunn1]

Actually rollback may be the only place where anything special needs to happen, interestingly the existing Argo Rollouts UI has zero support for workloadRef as there is no mention of it beyond 1 line in the generated API.