[AKS] Fix: Raise error when user provides invalid value for `--os-sku`#4810

zhoxing-ms merged 1 commit intoAzure:mainAzure/azure-cli-extensions:mainfrom

FumingZhang:fuming/fix-win-os-sku-0513FumingZhang/azure-cli-extensions:fuming/fix-win-os-sku-0513Copy head branch name to clipboard