Catch the `NoResponseError` rendered from `Net::DNS::Resolver` when it
detects no repsonse from the DNS server. We do this so that we can
`raise` our own `UnresolvableNameserverError` stating that there was
no repsonse. This allows us to differentiate between getting no answers
and getting no response from the system's DNS servers.

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/271575

Changelog: fixed