As a user i want to be able to clone a configmap from one cluster to another using PushSecret. At the moment we can only push individual keys from a secret, not individual keys from a configmap nor a whole configmap. Since ConfigMaps are first-class Kubernetes resources that provide a subset of the functionality offered by Secrets, consider expanding the scope of the Kubernetes provider PushSecret to also support ConfigMaps.

Prerequisites: #2836

AC:

users are able to clone a configmap across clusters using PushSecret
end-to-end tests cover this scenario