fedora-common-ostree: add archive repo to Silverblue
This is the culmination of a lot of work to make package layering
more reliable. This archive repo provides all packages that have
ever been in the updates repository, which means there should always
be a solution that will depsolve given the existing set of base layer
packages.
Pairing this along with https://github.com/coreos/rpm-ostree/pull/2125
means that we should finally see less of the split base layer vs update
repo problem and see less `Forbidden base package replacements` errors.
For context see https://github.com/coreos/fedora-coreos-tracker/issues/400
(cherry picked from commit 5ee6bcec8634f53418ca95684358c0529b1c6a37)