Transient failure in `spec/features/merge_requests/filter_merge_requests_spec.rb`

As seen in https://gitlab.com/gitlab-org/gitlab-ce/builds/15020300:

  1) Filter merge requests for assignee and label from issues#index assignee and label does not change when all link is clicked
     Failure/Error: expect(page).to have_issuable_counts(open: open_count, closed: closed_count, all: all_count)
       expected the following issuable counts: ["Open 1", "Closed 0", "All 1"] to be displayed
     # ./spec/support/merge_request_helpers.rb:17:in `expect_mr_list_count'
     # ./spec/features/merge_requests/filter_merge_requests_spec.rb:147:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:75:in `block (2 levels) in <top (required)>'

Finished in 19 minutes 17 seconds (files took 21.34 seconds to load)
692 examples, 1 failure

Failed examples:

rspec ./spec/features/merge_requests/filter_merge_requests_spec.rb:171 # Filter merge requests for assignee and label from issues#index assignee and label does not change when all link is clicked