Merge branch '10550-remove-ancestor-window' into 'master'

Removed target=_blank from ancestor link

Closes #10550

See merge request gitlab-org/gitlab-ee!10341

ee/app/assets/javascripts/sidebar/components/ancestors_tree/ancestors_tree.vue

@@ -78,7 +78,7 @@ export default {
           <icon :name="getIcon(ancestor)" />
         </div>
         <div class="vertical-timeline-content">
-          <gl-link :href="ancestor.url" target="_blank">{{ ancestor.title }}</gl-link>
+          <gl-link :href="ancestor.url">{{ ancestor.title }}</gl-link>
         </div>
       </li>
     </ul>