Add updated_at to epics search results

ee/app/views/search/results/_epic.html.haml

@@ -9,6 +9,8 @@
       %span.term.str-truncated.gl-font-weight-bold.gl-ml-2= epic.title
   .gl-text-gray-500.gl-my-3
     = sprintf(s_('%{group_name}&%{epic_iid} · created %{epic_created} by %{author}'), { group_name: epic.group.full_name, epic_iid: epic.iid, epic_created: time_ago_with_tooltip(epic.created_at, placement: 'bottom'), author: link_to_member(@project, epic.author, avatar: false) }).html_safe
+    ·
+    = _('updated %{time_ago}').html_safe % { time_ago: time_ago_with_tooltip(epic.updated_at, placement: 'bottom') }
   - if epic.description.present?
     .description.term.col-sm-10.gl-px-0
       = truncate(epic.description, length: 200)

ee/spec/features/search/user_searches_for_epics_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 RSpec.describe 'User searches for epics', :js do
   let!(:user) { create(:user) }
   let!(:group) { create(:group) }
-  let!(:epic1) { create(:epic, title: 'Foo', group: group) }
+  let!(:epic1) { create(:epic, title: 'Foo', group: group, updated_at: 6.days.ago) }
   let!(:epic2) { create(:epic, :closed, :confidential, title: 'Bar', group: group) }
 
   def search_for_epic(search)
@@ -30,6 +30,7 @@ RSpec.describe 'User searches for epics', :js do
 
     page.within('.results') do
       expect(page).to have_link(epic1.title)
+      expect(page).to have_text('updated 6 days ago')
       expect(page).not_to have_link(epic2.title)
     end
   end