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Do depexts status check at opam update time
Fixes #6461 Fixes https://github.com/ocaml/opam/issues/4172
Discussed on dev meeting: we need to store the os-family in the repository state cache in order to be able to invalidate it if the distribution/os/os-family changes (via config, environment variable, opam var, etc.).
This should make reftest's command opam-set-os no longer do an update. We keep #6741 as is (no revert), it's now a mainly a shortcut.