fix: wait a bit before bringing down the project node

Author: doorgan

apps/expert/lib/expert/engine_node.ex

@@ -58,7 +58,11 @@ defmodule Expert.EngineNode do
     end
 
     def stop(%__MODULE__{} = state, from, stop_timeout) do
-      project_rpc(state, System, :stop)
+      # Wait a little bit before stopping the node to allow the reply
+      # to be sent back to the caller before the node goes down.
+      :timer.apply_after(50, fn ->
+        project_rpc(state, System, :stop)
+      end)
       %{state | stopped_by: from, stop_timeout: stop_timeout, status: :stopping}
     end