Ssh: Test for EdDSA fails in native on RHEL8 when using default native image

[JiriOndrusek]

Follows #7211

The real limitation is a different then stated in #7211.

Default native image used by CQ (based on UBI9) requires GLIBC 2.33, which is not present on RHEL8.
Therefore to make EdDSA cipher work in native on RHEL8, you need to use a native image based on UBI8 (For example ubi-quarkus-mandrel-builder-image:jdk-21)