Use the Feature classloader instead of the default one to prevent classes being loaded to register fields as unsafe accessed to end up being build time initialized.

Resolves issues like the one described in https://github.com/quarkusio/quarkus/issues/39819#issuecomment-2031512653

Note: to better understand what changed use https://github.com/quarkusio/quarkus/pull/39831/files?diff=unified&w=1