[Fix] Add rolebinding namespace on namespace less ServiceAccount

[jt-dd]

In some cases, k8s ServiceAccount were added without namespace, which is not possible as they have to be bound to a namespace.

The error comes from the fact that rolebinding can be set on a namespace less service account (will bound automatically bound to the rolebinding one by default).

k describe rolebindings rb-test --namespace test                                                        
Name:         rb-test
Labels:       app=test-app
              chart_name=test-chart
              chart_version=0.1
              service=test-svc
              team=test-team
Annotations:  helm.sh/hook: post-install,post-upgrade
Role:
  Kind:  Role
  Name:  rb-test
Subjects:
  Kind            Name                Namespace
  ----            ----                ---------
  ServiceAccount  rb-test 

So if encountering this usecase, we add the namespace manually to rolebinding subjects and identity (serviceAccount) entries.

[edznux-dd]

I believe it would be a good thing to add that edge case in the test suite to avoid regression.

LGTM otherwise

[jt-dd]

I believe it would be a good thing to add that edge case in the test suite to avoid regression.

I modify the cluster config to test this behavior to avoid any regression in the future.