Flaky spec: "Labels Hierarchy issuable sidebar on issue sidebar behaves like assigning labels from sidebar can assign all ancestors labels" / spec/features/labels_hierarchy_spec.rb:178

Job #193260618 failed for 7b0f9f82:

  1) Labels Hierarchy issuable sidebar on issue sidebar behaves like assigning labels from sidebar can assign all ancestors labels
     Failure/Error: find('a.label-item', text: label.title).click

     Capybara::ElementNotFound:
       Unable to find visible css "a.label-item" with text "Label_1"
     Shared Example Group: "assigning labels from sidebar" called from ./spec/features/labels_hierarchy_spec.rb:178
     # ./spec/features/labels_hierarchy_spec.rb:32:in `block (4 levels) in <top (required)>'
     # ./spec/features/labels_hierarchy_spec.rb:25:in `each'
     # ./spec/features/labels_hierarchy_spec.rb:25:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:245:in `block (2 levels) in <top (required)>'

We should quarantine this.