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5e54819cee
fixes tailscale/corp#25612 We now keep track of any dns configurations which we could not compile. This gives RecompileDNSConfig a configuration to attempt to recompile and apply when the OS pokes us to indicate that the interface dns servers have changed/updated. The manager config will remain unset until we have the required information to compile it correctly which should eliminate the problematic SERVFAIL responses (especially on macOS 15). This also removes the missingUpstreamRecovery func in the forwarder which is no longer required now that we have proper error handling and recovery manager and the client. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>