DCP: Prevent double deletion of runner

lib/runner/connection.rb

@@ -135,6 +135,8 @@ class Runner::Connection
 
     case @status
       when :timeout
+        # The runner will destroyed. For the DockerContainerPool, this mechanism is necessary.
+        # However, it might not be required for Poseidon.
         @strategy.destroy_at_management
         @error = Runner::Error::ExecutionTimeout.new('Execution exceeded its time limit')
       when :terminated_by_codeocean, :terminated_by_management

lib/runner/strategy/docker_container_pool.rb

@@ -90,7 +90,6 @@ class Runner::Strategy::DockerContainerPool < Runner::Strategy
       end
     rescue Timeout::Error
       socket.close(:timeout)
-      destroy_at_management
     end
     socket
   end