Revert back to single-file actions

app/assets/javascripts/mr_notes/stores/actions.js

-export * from './actions/mutators';
+import types from './mutation_types';
+
+export function setActiveTab({ commit }, tab) {
+  commit(types.SET_ACTIVE_TAB, tab);
+}
+
+export function setEndpoints({ commit }, endpoints) {
+  commit(types.SET_ENDPOINTS, endpoints);
+}

app/assets/javascripts/mr_notes/stores/actions/mutators.js

-import types from '../mutation_types';
-
-// Actions that exclusively mutate the state (essentially wrappers for `commit`)
-
-export function setActiveTab({ commit }, tab) {
-  commit(types.SET_ACTIVE_TAB, tab);
-}
-
-export function setEndpoints({ commit }, endpoints) {
-  commit(types.SET_ENDPOINTS, endpoints);
-}

spec/frontend/mr_notes/stores/actions/mutators_spec.js → spec/frontend/mr_notes/stores/actions_spec.js

 import testAction from 'helpers/vuex_action_helper';
-import { setEndpoints } from '~/mr_notes/stores/actions/mutators';
+import { setEndpoints } from '~/mr_notes/stores/actions';
 import mutationTypes from '~/mr_notes/stores/mutation_types';
 
 describe('MR Notes Mutator Actions', () => {