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When recommending an exit node, suggestExitNodeLocked ranks candidates by the latency to their home DERP region, taken from the most recent netcheck report. But netcheck alternates between full reports, which probe every region, and incremental reports, which only re-probe the home region and a handful of the fastest regions. When the most recent report is incremental, the suggestion fell back to a random for exit nodes that are far away. Now we rank candidates against the best recent latency, tracked by the `netcheck.Client` - the same data that is used to pick the preferred DERP. It uses a history of measurements which includes a full netcheck report, so should cover all DERP regions. Updates tailscale/corp#17516 Signed-off-by: Anton Tolchanov <anton@tailscale.com>