Move cluster dropdown store one level up

Move cluster dropdown Vuex store module to the
create cluster app directory. In that way, the
create GKE cluster store can use this module.

app/assets/javascripts/create_cluster/eks_cluster/store/index.js

@@ -4,7 +4,7 @@ import * as getters from './getters';
 import mutations from './mutations';
 import state from './state';
 
-import clusterDropdownStore from './cluster_dropdown';
+import clusterDropdownStore from '~/create_cluster/store/cluster_dropdown';
 
 import {
   fetchRoles,

spec/frontend/create_cluster/eks_cluster/components/eks_cluster_configuration_form_spec.js

@@ -5,7 +5,7 @@ import { GlFormCheckbox } from '@gitlab/ui';
 
 import EksClusterConfigurationForm from '~/create_cluster/eks_cluster/components/eks_cluster_configuration_form.vue';
 import eksClusterFormState from '~/create_cluster/eks_cluster/store/state';
-import clusterDropdownStoreState from '~/create_cluster/eks_cluster/store/cluster_dropdown/state';
+import clusterDropdownStoreState from '~/create_cluster/store/cluster_dropdown/state';
 
 const localVue = createLocalVue();
 localVue.use(Vuex);

spec/frontend/create_cluster/eks_cluster/store/cluster_dropdown/actions_spec.js → spec/frontend/create_cluster/store/cluster_dropdown/actions_spec.js

 import testAction from 'helpers/vuex_action_helper';
 
-import createState from '~/create_cluster/eks_cluster/store/cluster_dropdown/state';
-import * as types from '~/create_cluster/eks_cluster/store/cluster_dropdown/mutation_types';
-import actionsFactory from '~/create_cluster/eks_cluster/store/cluster_dropdown/actions';
+import createState from '~/create_cluster/store/cluster_dropdown/state';
+import * as types from '~/create_cluster/store/cluster_dropdown/mutation_types';
+import actionsFactory from '~/create_cluster/store/cluster_dropdown/actions';
 
 describe('Cluster dropdown Store Actions', () => {
   const items = [{ name: 'item 1' }];

spec/frontend/create_cluster/eks_cluster/store/cluster_dropdown/mutations_spec.js → spec/frontend/create_cluster/store/cluster_dropdown/mutations_spec.js

@@ -2,9 +2,9 @@ import {
   REQUEST_ITEMS,
   RECEIVE_ITEMS_SUCCESS,
   RECEIVE_ITEMS_ERROR,
-} from '~/create_cluster/eks_cluster/store/cluster_dropdown/mutation_types';
-import createState from '~/create_cluster/eks_cluster/store/cluster_dropdown/state';
-import mutations from '~/create_cluster/eks_cluster/store/cluster_dropdown/mutations';
+} from '~/create_cluster/store/cluster_dropdown/mutation_types';
+import createState from '~/create_cluster/store/cluster_dropdown/state';
+import mutations from '~/create_cluster/store/cluster_dropdown/mutations';
 
 describe('Cluster dropdown store mutations', () => {
   let state;