Print warning when verification properties misconfigured

[canny]

For verification, either the provider name and consumer version selectors should be specified OR a pact URL should be specified. Configuring any mix of the two combinations is likely an error and will confuse new users.

https://pact.canny.io/admin/board/feature-requests/p/print-warning-when-verification-properties-misconfigured

[canny]

This issue has been linked to a Canny post: Print warning when verification properties misconfigured 🎉