Hide chemlab banner

qa/qa/runtime/browser.rb

@@ -179,6 +179,7 @@ module QA
           config.browser = Capybara.current_session.driver.browser # reuse Capybara session
           config.libraries = [GitlabHandbook]
           config.base_url = Runtime::Scenario.attributes[:gitlab_address] # reuse GitLab address
+          config.hide_banner = true
         end
       end
       # rubocop: enable Metrics/AbcSize