[9.20] fix: usr: Return DNS COOKIE and NSID with BADVERS

This change allows the client to identify the server that returns the
BADVERS and to provide a DNS SERVER COOKIE to be included in the
resend of the request.

Closes #5235

Backport of MR !10334

Merge branch 'backport-5235-return-the-server-cookie-when-returning-badvers-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!10392