Replaces underscore with lodash

ee/app/assets/javascripts/boards/mixins/issue_card_inner.js

-import _ from 'underscore';
+import { isNumber } from 'lodash';
 
 export default {
   computed: {
     validIssueWeight() {
-      if (this.issue && _.isNumber(this.issue.weight)) {
+      if (this.issue && isNumber(this.issue.weight)) {
         return this.issue.weight >= 0;
       }
 

ee/app/assets/javascripts/boards/stores/boards_store_ee.js

 /* eslint-disable class-methods-use-this */
-import _ from 'underscore';
+import { sortBy } from 'lodash';
 import Cookies from 'js-cookie';
 import { __, sprintf } from '~/locale';
 import sidebarEventHub from '~/sidebar/event_hub';
@@ -156,7 +156,7 @@ class BoardsStoreEE {
       position: 0,
     });
 
-    this.store.state.lists = _.sortBy(this.store.state.lists, 'position');
+    this.store.state.lists = sortBy(this.store.state.lists, 'position');
   }
 
   removePromotion() {