[Containerapp] az containerapp arc: Enable setup custom core dns for Openshift#8858

zhoxing-ms merged 9 commits intoAzure:mainAzure/azure-cli-extensions:mainfrom

anandgmenon:containerapp/core-dns-openshiftanandgmenon/azure-cli-extensions:containerapp/core-dns-openshiftCopy head branch name to clipboard