doc: nil: Add a section about AI use in BIND 9 issue templates

Generally speaking, no AI generated slop is permitted.  If AI has been
used to find an actual problem, the findings need to be verified by a
person, and the report should be written by the person.  No copy and
paste is allowed.  Anyone reporting the problem needs to be able to
verify the problem independently of the AI.

Merge branch 'ondrej/no-ai-templates' into 'main'

See merge request isc-projects/bind9!11105