[9.18] fix: usr: Remove NSEC/DS/NSEC3 RRSIG check from dns_message_parse

Previously, when parsing responses, named incorrectly rejected responses without matching RRSIG records for NSEC/DS/NSEC3 records in the authority section. This rejection, if appropriate, should have been left for the validator to determine and has been fixed.

Closes #5185

Backport of MR !10125

Merge branch 'backport-5185-remove-rrsig-check-from-dns_message_parse-9.18' into 'bind-9.18'

See merge request isc-projects/bind9!10143