This change includes a test that illustrates the use-case.

Basically, when two registries are configured and the primary one recommends a platform based on a Quarkus version that is not promoted anymore by the second registry, when a user creates a new projects using extensions from the platform from the second registry, the latest version of the platform provided by the second registry should be selected.

Before this change, the registry client would select a platform version that was based on the same version Quarkus that the primary registry recommends.