apps: cover request attributes in req test recipe

Generate certificate requests with attributes taken from the
configuration, using both the prompting style entries and the
prompt = no style, and check that the attributes appear in the
printed request text.

Assisted-by: Claude:claude-fable-5
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Daniel Kubec <kubec@openssl.foundation>
Merge-date: Mon Sep  7 18:09:32 2026
Merged-from: https://github.com/openssl/openssl/pull/32628