Fix 3.0 branch to skip tests if using 3.4

PR #25147 removes the POST being allowed to be skipped.
This causes issue when testing 3.0 with the 3.4 provider.

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25159)