Merge branch 'qa-tag-report-section-expand' into 'master'

Added a QA tag to the report component expand button

See merge request gitlab-org/gitlab-ce!28416

app/assets/javascripts/reports/components/report_section.vue

@@ -156,7 +156,7 @@ export default {
         <button
           v-if="isCollapsible"
           type="button"
-          class="js-collapse-btn btn float-right btn-sm"
+          class="js-collapse-btn btn float-right btn-sm qa-expand-report-button"
           @click="toggleCollapsed"
         >
           {{ collapseText }}