Instruct user to upgrade to the latest version if a command (group) is not found

**Is your feature request related to a problem? Please describe.**

Users are complaining `az config` can't be found: https://github.com/MicrosoftDocs/azure-docs-cli/issues/2469, https://github.com/MicrosoftDocs/azure-docs-cli/issues/2465

**Describe the solution you'd like**

Instead of showing error message


The error message can instruct the user to upgrade to the latest version if a command (group) is not found.

**Describe alternatives you've considered**

As provided in https://ceapex.visualstudio.com/Engineering/_workitems/edit/327926, the `long-summary` of the command can show the minimal version, but this takes much greater development effort.

> This command (group) requires Azure CLI version xx.xx.xx