add DNSSEC EDE test for unsupported digest and alg

add DNSSEC EDE test for unsupported digest and alg

A DNSSEC validation can fail in the case where multiple DNSKEY are
available for a zone and none of them are supported, but for different
reasons: one has a DS record in the parent zone using an unsupported
digest while the other one uses an unsupported encryption algorithm.

Add a specific test case covering this flow and making sure that two
extended DNS error are provided: code 1 and 2, each of them highlighting
unsupported algorithm and digest.