flatpak: do not fetch updates every time we check the size of a package
It makes libflatpak (libsoup internally) go bonkers. It also makes the whole startup much slower (understandably). By using FlatpakRemoteRef instead of querying the FlatpakInstallation we have the opportunity for some optimisations since we're querying the FlatpakRemoteRef twice for some (most?) available packages.
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