Handle switching a remote type between OCI and non-OCI
Handle switching a remote type between OCI and non-OCI

When we switch the remote type, we need to clean up cached files
(appstream, OCI index/summary) because they are stored differently
for the two types of remote.

flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak