Testing reconnect on start_itde

[tkilias]

Add a test to https://github.com/exasol/notebook-connector/blob/main/test/integration/test_itde_manager_in_docker_container.py which check if reconnection in start_itde works

• Sketch

  exec_result = docker_container.exec_run("python3 /tmp/bring_itde    _up.py")
  disconnect_container(docker_container)
  exec_result = docker_container.exec_run("python3 /tmp/start_itde.py")
  assert dockcontainer_is_connected