fix: dev: Check options in templates that must be non-zero

`named-checkconf` should reject a template that has options that must be non-zero
(`max-refresh-time`, `max-retry-time`, `min-refresh-time`, `min-retry-time`).

`rndc addzone` with a zone that refers to such template should fail cleanly.

Closes #6041

Merge branch '6041-check-nonzero-skips-templates' into 'main'

See merge request isc-projects/bind9!12126