[OpenShift] Add a version label on namespace
[OpenShift] Add a version label on namespace

This adds a version label to namespace which would be useful while
upgrading for rbac resources.

Signed-off-by: Shivam Mukhade <330299940dbe3b9a5e12a3de6ca29752465435c4@redhat.com>

tektoncd/operator,tektoncd/operator,tektoncd/operator