apps: cover the genrsa error cases and verbose mode in the test recipe

Cover the bad option failures (unknown cipher, invalid primes,
bits and password arguments) as well as the key generation failure
with an invalid number of primes, verifying the error messages
printed to stderr.  Also cover the -verbose progress output and
check that -quiet suppresses it.

Assisted-by: Claude:claude-fable-5
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.foundation>
Merge-date: Mon Sep  7 14:15:50 2026
Merged-from: https://github.com/openssl/openssl/pull/32592