Replace underscore for lodash in ee/epic

ee/app/assets/javascripts/epic/components/sidebar_items/sidebar_date_picker.vue

 <script>
-import _ from 'underscore';
+import { uniqueId } from 'lodash';
 import { GlLoadingIcon, GlButton } from '@gitlab/ui';
 
 import { __, s__ } from '~/locale';
@@ -102,7 +102,7 @@ export default {
     fieldName: {
       type: String,
       required: false,
-      default: () => _.uniqueId('dateType_'),
+      default: () => uniqueId('dateType_'),
     },
   },
   data() {

ee/app/assets/javascripts/epic/components/sidebar_items/sidebar_labels.vue

 <script>
 import { mapState, mapActions } from 'vuex';
-import _ from 'underscore';
+import { debounce } from 'lodash';
 
 import ListLabel from '../../models/label';
 
@@ -66,7 +66,7 @@ export default {
       // dropdown as otherwise it causes `calc()`
       // used in CSS to miscalculate collapsed
       // sidebar size.
-      _.debounce(() => {
+      debounce(() => {
         this.sidebarExpandedOnClick = true;
         if (contentContainer) {
           contentContainer