Temporarily disable gost-engine tests in ci

Temporarily disable gost-engine tests in ci

We need to temporarily disable this as we have a build break in CI:
https://github.com/openssl/openssl/actions/runs/14192630435

Its occuring because gost-engine depends on libprov, which requires a
minimum version cmake-3.0.  The update of github runners to cmake-4.0
causes a bail out as cmake 4.0 no longers supports cmake 3.0 syntax.

Libprov is fixed now, but gost-engine needs to update its libprov
submodule, and then we need to update the gost-engine submodule.  Until
thats done (which may take days), we should disable the gost-engine
external tests

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27234)