Another attempt at access_control_ce_spec

What does this MR do?

EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11123

Another attempt to fix https://gitlab.com/gitlab-org/gitlab-ce/issues/31827

I originally thought this was due to dropdown animations, but the test passes locally even when I extend the animation so much that its "invisible" for the whole test.

This change is a shot in the dark on the assumption that if its not to do with the dropdown animations, it must be to do with the action that triggers the dropdown. Maybe this true click is slightly missing or hitting a deadzone for whatever strange reason and maybe this programmatic click will fix that.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?