Refactor draft_note_spec.js to Vue test utils (CE backport)

app/assets/javascripts/notes/components/note_actions.vue

@@ -135,6 +135,7 @@ export default {
     <span v-if="accessLevel" class="note-role user-access-role">{{ accessLevel }}</span>
     <div v-if="canResolve" class="note-actions-item">
       <button
+        ref="resolveButton"
         v-gl-tooltip
         :class="{ 'is-disabled': !resolvable, 'is-active': isResolved }"
         :title="resolveButtonTitle"