Replaces underscore with lodash and native func

app/assets/javascripts/issuable_suggestions/components/app.vue

 <script>
-import _ from 'underscore';
 import { GlTooltipDirective } from '@gitlab/ui';
 import { __ } from '~/locale';
 import Icon from '~/vue_shared/components/icon.vue';
@@ -48,7 +47,7 @@ export default {
   },
   computed: {
     isSearchEmpty() {
-      return _.isEmpty(this.search);
+      return !this.search.length;
     },
     showSuggestions() {
       return !this.isSearchEmpty && this.issues.length && !this.loading;

app/assets/javascripts/issuable_suggestions/components/item.vue

 <script>
 /* eslint-disable @gitlab/vue-i18n/no-bare-strings */
-import _ from 'underscore';
+import { uniqueId } from 'lodash';
 import { GlLink, GlTooltip, GlTooltipDirective } from '@gitlab/ui';
 import { __ } from '~/locale';
 import Icon from '~/vue_shared/components/icon.vue';
@@ -36,13 +36,13 @@ export default {
     counts() {
       return [
         {
-          id: _.uniqueId(),
+          id: uniqueId(),
           icon: 'thumb-up',
           tooltipTitle: __('Upvotes'),
           count: this.suggestion.upvotes,
         },
         {
-          id: _.uniqueId(),
+          id: uniqueId(),
           icon: 'comment',
           tooltipTitle: __('Comments'),
           count: this.suggestion.userNotesCount,