fix(testing): skip environment-impossible checks instead of warning

Four warnings fired on every headless VM run, training the reader to ignore the warning count: the Hyprland socket and portal queries (no graphical login), the mDNS ping (slirp passes no multicast), and docker-not-responding (enabled but deliberately not started pre-reboot). Each now detects its precondition and logs a skip that counts nowhere; the warn paths stay for the cases that are real (compositor running without a socket, portal running but unqueryable, mDNS failing on real networking, docker active but dead). The lingering warning stays — it needs its own investigation.

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