Adding an alias(custom-ca-cert) for proxy-cert param for connectedK8s#5423

zhoxing-ms merged 2 commits intoAzure:mainAzure/azure-cli-extensions:mainfrom

pmpMsft:feature/connectedK8s/customCertpmpMsft/azure-cli-extensions:feature/connectedK8s/customCertCopy head branch name to clipboard