[CI] Decomission OpenShift 4.11 CI cluster

Summary

• Remove 4.11 from pipelines
• backport changes into stable branches
• remove 4.11 related configuration from project
• decomission clusters (.com and dev)
  • https://gitlab.com/gitlab-org/distribution/infrastructure/openshift-provisioning/-/issues/37+
  • https://gitlab.com/gitlab-org/distribution/infrastructure/openshift-provisioning/-/issues/41+