Remove incorrect localVue usage

localVue is required only with use method

ee/spec/frontend/vue_shared/components/accordion/accordion_item_spec.js

-import { shallowMount, createLocalVue } from '@vue/test-utils';
+import { shallowMount } from '@vue/test-utils';
 import { uniqueId } from 'underscore';
 
 import { AccordionItem } from 'ee/vue_shared/components/accordion';
@@ -12,8 +12,6 @@ jest.mock('ee/vue_shared/components/accordion/accordion_event_bus', () => ({
 
 jest.mock('underscore');
 
-const localVue = createLocalVue();
-
 describe('AccordionItem component', () => {
   const mockUniqueId = 'mockUniqueId';
   const accordionId = 'accordionID';
@@ -28,7 +26,6 @@ describe('AccordionItem component', () => {
     };
 
     wrapper = shallowMount(AccordionItem, {
-      localVue,
       sync: false,
       propsData: {
         ...defaultPropsData,

ee/spec/frontend/vue_shared/components/accordion/accordion_spec.js

-import { shallowMount, createLocalVue } from '@vue/test-utils';
+import { shallowMount } from '@vue/test-utils';
 import { Accordion } from 'ee/vue_shared/components/accordion';
 
 import { uniqueId } from 'underscore';
 
 jest.mock('underscore');
 
-const localVue = createLocalVue();
-
 describe('Accordion component', () => {
   let wrapper;
   const factory = ({ defaultSlot = '' } = {}) => {
     wrapper = shallowMount(Accordion, {
-      localVue,
       sync: false,
       scopedSlots: {
         default: defaultSlot,

ee/spec/frontend/vue_shared/components/sidebar/epics_select/base_spec.js

-import { shallowMount, createLocalVue } from '@vue/test-utils';
+import { shallowMount } from '@vue/test-utils';
 import { GlLoadingIcon } from '@gitlab/ui';
 
 import EpicsSelectBase from 'ee/vue_shared/components/sidebar/epics_select/base.vue';
@@ -32,7 +32,6 @@ describe('EpicsSelect', () => {
       setFixtures('<div class="flash-container"></div>');
       wrapper = shallowMount(EpicsSelectBase, {
         store,
-        localVue: createLocalVue(),
         propsData: {
           canEdit: true,
           blockTitle: 'Epic',

ee/spec/frontend/vue_shared/components/sidebar/epics_select/dropdown_search_input_spec.js

-import { createLocalVue, shallowMount } from '@vue/test-utils';
+import { shallowMount } from '@vue/test-utils';
 
 import { GlButton } from '@gitlab/ui';
 import DropdownSearchInput from 'ee/vue_shared/components/sidebar/epics_select/dropdown_search_input.vue';
 import Icon from '~/vue_shared/components/icon.vue';
 
-const createComponent = () => {
-  const localVue = createLocalVue();
-
-  return shallowMount(DropdownSearchInput, {
-    localVue,
+const createComponent = () =>
+  shallowMount(DropdownSearchInput, {
     directives: {
       /**
        * We don't want any observers
@@ -18,7 +15,6 @@ const createComponent = () => {
       autofocusonshow: {},
     },
   });
-};
 
 describe('EpicsSelect', () => {
   describe('DropdownSearchInput', () => {

ee/spec/frontend/vue_shared/security_reports/card_security_reports_app_spec.js

-import { mount, createLocalVue } from '@vue/test-utils';
+import { mount } from '@vue/test-utils';
 import { GlEmptyState } from '@gitlab/ui';
 import MockAdapter from 'axios-mock-adapter';
 import { TEST_HOST } from 'helpers/test_constants';
@@ -8,8 +8,6 @@ import createStore from 'ee/security_dashboard/store';
 import { trimText } from 'helpers/text_helper';
 import axios from '~/lib/utils/axios_utils';
 
-const localVue = createLocalVue();
-
 const vulnerabilitiesEndpoint = `${TEST_HOST}/vulnerabilities`;
 const vulnerabilitiesSummaryEndpoint = `${TEST_HOST}/vulnerabilities_summary`;
 
@@ -22,7 +20,6 @@ describe('Card security reports app', () => {
 
   const createComponent = props => {
     wrapper = mount(CardSecurityDashboardApp, {
-      localVue,
       store: createStore(),
       sync: false,
       attachToDocument: true,

ee/spec/frontend/vue_shared/security_reports/components/vulnerability_details_spec.js

-import { createLocalVue, mount } from '@vue/test-utils';
+import { mount } from '@vue/test-utils';
 import createState from 'ee/vue_shared/security_reports/store/state';
 import VulnerabilityDetails from 'ee/vue_shared/security_reports/components/vulnerability_details.vue';
 import SeverityBadge from 'ee/vue_shared/security_reports/components/severity_badge.vue';
@@ -7,12 +7,10 @@ import { TEST_HOST } from 'helpers/test_constants';
 
 describe('VulnerabilityDetails component', () => {
   let wrapper;
-  const localVue = createLocalVue();
 
   const componentFactory = (options = {}) => {
-    wrapper = mount(localVue.extend(VulnerabilityDetails), {
+    wrapper = mount(VulnerabilityDetails, {
       ...options,
-      localVue,
       sync: false,
     });
   };