Flaky test spec/features/merge_request/user_views_diffs_spec.rb:63 # User views diffs expands all diffs

As can be seen in https://gitlab.com/gitlab-org/gitlab/-/jobs/751827586

     Got 1 failure and 1 other error:

     1.1) Failure/Error: expect(page).to have_button('Expand all')
            expected to find visible button "Expand all" that is not disabled but there were no matches. Also found "", which matched the selector but not all filters.
          # ./spec/features/merge_request/user_views_diffs_spec.rb:66:in `block (2 levels) in <main>'
          # ./spec/spec_helper.rb:336:in `block (3 levels) in <main>'
          # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
          # ./spec/spec_helper.rb:327:in `block (2 levels) in <main>'
          # ./spec/spec_helper.rb:323:in `block (3 levels) in <main>'
          # ./spec/spec_helper.rb:323:in `block (2 levels) in <main>'
          # -e:1:in `<main>'