setup-extra-data: Avoid extra work for ostree-metadata and appstream branches
setup-extra-data: Avoid extra work for ostree-metadata and appstream branches

We never have extra data for non app/ or runtime/ refs, so lets not
do an unnecessary pull there.

flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak