GitLab uses a kubernetes service account to perform deployments. For
serverless deployments to work as expected with externally created
clusters with their own knative installations (e.g. via Cloud Run), this
account requires additional permissions in the serving.knative.dev API
group.
Includes RoleBinding methods to Kubeclient and introduce a new lib class
to generate RoleBinding resources.
This MR is part of
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22011