Replace underscore/lodash in feature_flags

This replaces all the usage of underscore
for lodash inside the ee feature
feature_flags

ee/app/assets/javascripts/feature_flags/components/environments_dropdown.vue

 <script>
-import _ from 'underscore';
+import { isEmpty } from 'lodash';
 import { GlLoadingIcon, GlButton } from '@gitlab/ui';
 import axios from '~/lib/utils/axios_utils';
 import { __ } from '~/locale';
@@ -80,7 +80,7 @@ export default {
      * @returns Boolean
      */
     shouldRenderCreateButton() {
-      return !_.isEmpty(this.filter) && !this.isLoading && !this.results.length;
+      return !isEmpty(this.filter) && !this.isLoading && !this.results.length;
     },
   },
   watch: {

ee/app/assets/javascripts/feature_flags/components/feature_flags.vue

 <script>
 import { createNamespacedHelpers } from 'vuex';
-import _ from 'underscore';
+import { isEmpty } from 'lodash';
 import { GlEmptyState, GlLoadingIcon, GlButton, GlModalDirective, GlLink } from '@gitlab/ui';
 import FeatureFlagsTable from './feature_flags_table.vue';
 import store from '../store';
@@ -148,7 +148,7 @@ export default {
       ];
     },
     hasNewPath() {
-      return !_.isEmpty(this.newFeatureFlagPath);
+      return !isEmpty(this.newFeatureFlagPath);
     },
     emptyStateTitle() {
       if (this.scope === this.$options.scopes.disabled) {

ee/app/assets/javascripts/feature_flags/components/feature_flags_table.vue

 <script>
-import _ from 'underscore';
+import { escape as esc } from 'lodash';
 import { GlButton, GlTooltipDirective, GlModal, GlToggle } from '@gitlab/ui';
 import { sprintf, s__ } from '~/locale';
 import Icon from '~/vue_shared/components/icon.vue';
@@ -41,7 +41,7 @@ export default {
       return sprintf(
         s__('FeatureFlags|Delete %{name}?'),
         {
-          name: _.escape(this.deleteFeatureFlagName),
+          name: esc(this.deleteFeatureFlagName),
         },
         false,
       );
@@ -50,7 +50,7 @@ export default {
       return sprintf(
         s__('FeatureFlags|Feature flag %{name} will be removed. Are you sure?'),
         {
-          name: _.escape(this.deleteFeatureFlagName),
+          name: esc(this.deleteFeatureFlagName),
         },
         false,
       );

ee/app/assets/javascripts/feature_flags/components/form.vue

 <script>
 import Vue from 'vue';
-import _ from 'underscore';
+import { memoize, isString } from 'lodash';
 import {
   GlButton,
   GlBadge,
@@ -134,7 +134,7 @@ export default {
      * @param {Object} scope
      */
     removeScope(scope) {
-      if (_.isString(scope.id) && scope.id.startsWith(INTERNAL_ID_PREFIX)) {
+      if (isString(scope.id) && scope.id.startsWith(INTERNAL_ID_PREFIX)) {
         this.formScopes = this.formScopes.filter(s => s !== scope);
       } else {
         Vue.set(scope, 'shouldBeDestroyed', true);
@@ -169,7 +169,7 @@ export default {
       return !this.permissionsFlag || scope.canUpdate;
     },
 
-    isRolloutPercentageInvalid: _.memoize(function isRolloutPercentageInvalid(percentage) {
+    isRolloutPercentageInvalid: memoize(function isRolloutPercentageInvalid(percentage) {
       return !this.$options.rolloutPercentageRegex.test(percentage);
     }),
 

ee/app/assets/javascripts/feature_flags/constants.js

-import _ from 'underscore';
+import { property } from 'lodash';
 
 export const ROLLOUT_STRATEGY_ALL_USERS = 'default';
 export const ROLLOUT_STRATEGY_PERCENT_ROLLOUT = 'gradualRolloutUserId';
@@ -12,5 +12,5 @@ export const ALL_ENVIRONMENTS_NAME = '*';
 
 export const INTERNAL_ID_PREFIX = 'internal_';
 
-export const fetchPercentageParams = _.property(['parameters', 'percentage']);
-export const fetchUserIdParams = _.property(['parameters', 'userIds']);
+export const fetchPercentageParams = property(['parameters', 'percentage']);
+export const fetchUserIdParams = property(['parameters', 'userIds']);

ee/app/assets/javascripts/feature_flags/store/modules/helpers.js

-import _ from 'underscore';
+import { isEmpty, uniqueId, isString } from 'lodash';
 import {
   ROLLOUT_STRATEGY_ALL_USERS,
   ROLLOUT_STRATEGY_PERCENT_ROLLOUT,
@@ -74,7 +74,7 @@ export const mapFromScopesViewModel = params => {
     }
 
     // Strip out any internal IDs
-    const id = _.isString(s.id) && s.id.startsWith(INTERNAL_ID_PREFIX) ? undefined : s.id;
+    const id = isString(s.id) && s.id.startsWith(INTERNAL_ID_PREFIX) ? undefined : s.id;
 
     const strategies = [
       {
@@ -83,7 +83,7 @@ export const mapFromScopesViewModel = params => {
       },
     ];
 
-    if (!_.isEmpty(userIdParameters)) {
+    if (!isEmpty(userIdParameters)) {
       strategies.push({ name: ROLLOUT_STRATEGY_USER_ID, parameters: userIdParameters });
     }
 
@@ -123,7 +123,7 @@ export const createNewEnvironmentScope = (overrides = {}, featureFlagPermissions
   const defaultScope = {
     environmentScope: '',
     active: false,
-    id: _.uniqueId(INTERNAL_ID_PREFIX),
+    id: uniqueId(INTERNAL_ID_PREFIX),
     rolloutStrategy: ROLLOUT_STRATEGY_ALL_USERS,
     rolloutPercentage: DEFAULT_PERCENT_ROLLOUT,
     rolloutUserIds: '',