Return a more helpful error message when an invalid API key is used

[richardlewisjones]

When an invalid API key is used, users see this error message:

Please check if you are using the latest version of CLI and retry the command 
If you are still facing issues, please report it on our community slack or open a GitHub issue (https://github.com/civo/cli/issues) 
Error: DatabaseAccountNotFoundError: Failed to find the account within the internal database

The error message does not mention the API key, and a reference to 'the internal database' is not helpful. A better message would be something like API key is invalid. See https://www.civo.com/api#authentication