Transient failures in spec/features/admin/admin_health_check_spec.rb

As seen at https://gitlab.com/gitlab-org/gitlab-ce/builds/13645643:

  1) Admin Health Check #show reload access token changes the access token
     Failure/Error: click_button 'Reset health check access token'

     Capybara::ElementNotFound:
       Unable to find button "Reset health check access token"
     # ./spec/features/admin/admin_health_check_spec.rb:30:in `block (4 levels) in <top (required)>'
     # ./spec/spec_helper.rb:65:in `block (2 levels) in <top (required)>'

Finished in 20 minutes 30 seconds (files took 23.51 seconds to load)
1442 examples, 1 failure

Failed examples:

rspec ./spec/features/admin/admin_health_check_spec.rb:28 # Admin Health Check #show reload access token changes the access token