ossl_print_attribute_value(): use a sequence value only if type is a sequence

Move the switch to print a distinguished name inside the
switch by the printed attribute type, otherwise a malformed
attribute will cause a crash.

Updated the fuzz corpora with the testcase

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/25087)