[bug] Flaky test: test_topology_graph

[nemesifier]

Describe the bug
We have another flaky test:

ERROR: test_topology_graph (__main__.TestServices)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/openwisp/docker-openwisp/tests/runtests.py", line 174, in test_topology_graph
    self.action_on_resource(label, path, 'update_selected')
  File "/opt/openwisp/docker-openwisp/tests/utils.py", line 180, in action_on_resource
    self.select_resource(name)
  File "/opt/openwisp/docker-openwisp/tests/utils.py", line 164, in select_resource
    driver.find_element(By.XPATH, path).click()
  File "/usr/local/lib/python3.10/dist-packages/selenium/webdriver/remote/webdriver.py", line 748, in find_element
    return self.execute(Command.FIND_ELEMENT, {"using": by, "value": value})["value"]
  File "/usr/local/lib/python3.10/dist-packages/selenium/webdriver/remote/webdriver.py", line 354, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.10/dist-packages/selenium/webdriver/remote/errorhandler.py", line [22](https://github.com/openwisp/docker-openwisp/actions/runs/10424215459/job/28872566783?pr=344#step:9:23)9, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//a[contains(text(), "automated-selenium-test-02")]/../..//input[@name="_selected_action"]"}
  (Session info: chrome-headless-shell=1[27](https://github.com/openwisp/docker-openwisp/actions/runs/10424215459/job/28872566783?pr=344#step:9:28).0.6533.99); For documentation on this error, please visit: https://www.selenium.dev/documentation/webdriver/troubleshooting/errors#no-such-element-exception

Steps To Reproduce
Run make runtests. The test fails randomly.

Expected behavior
Test should always pass.

System Informatioon:
Observed in CI builds.