fix: dev: fix configuration bugs involving global defaults

The configuration code for the `max-cache-size`, `dnssec-validation`, and `response-padding` options were unnecessarily complicated, and in the case of `max-cache-size`, buggy. These have been fixed. The `optionmaps` variable in `configure_view()` is no longer needed and has been removed.

Merge branch 'each-cleanup-defaultconfig' into 'main'

See merge request isc-projects/bind9!11165