Add DNSKEY/RRSIG existence but missing DS in results_technical in API

[bwbroersma]

For research purposes it would be nice to see when a domain fails for DNSSEC, but does provide DNSSEC signatures and has a DNSKEY.

Forged example (via direct URL entry, since the domain does not provide an A-record so doesn't pass the initial qualification to be checked) is randstad380kv-noordring.nl, see the current test report which obviously fails because of a missing DS-record:

$ dig +noall  +question +answer +dnssec DNSKEY randstad380kv-noordring.nl
;randstad380kv-noordring.nl.	IN	DNSKEY
randstad380kv-noordring.nl. 43200 IN	DNSKEY	257 3 13 4WrilUFwJ71BsKhUMGv3Kn2xLV1O8JV/jdGvHQvkDipGZFZ+2lLb5x2H P3dmhxOQcPbwNtAOISjuoIlmplvXAg==
randstad380kv-noordring.nl. 43200 IN	RRSIG	DNSKEY 13 2 86400 20230525000000 20230504000000 39760 randstad380kv-noordring.nl. ugHPV/sqNIUw3RWIYU2Wm8Utxx3P2AGb9Ad9iJRRGMflImhcmEHipHq5 mmf5SAip2dCBOGdIECzdwjeJ++xS8A==

$ dig +noall +question +answer DS randstad380kv-noordring.nl
;randstad380kv-noordring.nl.	IN	DS

It would be nice to know it's failing because the DS records are not set up.

Other linked relevant issues that could bring more DNSSEC info to the API: #188, #976 and #978.