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This patch adds a new `client-side-reachability-routecheck` node attribute to allow admins to selectively enable background routecheck probing on trial nodes. The current implementation is still experimental. It adds the routecheck.IsEnabled helper to check for the new `client-side-reachability-routecheck` node attribute alongside the existing `client-side-reachability` node attribute in this node’s self capabilities. This allows administrators to turn on and off this feature by editing the policy file. It adds the `TS_DEBUG_FORCE_CLIENT_SIDE_REACHABILITY_ROUTECHECK` environment variable which can be set to override the policy file. When set to `true`, it forcibly enables this feature. And when set to `false`, it forcibly disables it. Updates #17366 Updates tailscale/corp#33033 Signed-off-by: Simon Law <sfllaw@tailscale.com>