net/dns: use direct when NetworkManager has no systemd-resolved

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Endeavour OS, at least, uses NetworkManager 1.44.2 and does
not use systemd-resolved behind the scenes at all. If we
find ourselves in that situation, return "direct" not
"systemd-resolved"

Fixes https://github.com/tailscale/tailscale/issues/9687

Signed-off-by: Denton Gentry <dgentry@tailscale.com>

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