Update eslint-plugin-import from 2.16.0 to 2.18.2

only for EE-specific contents under ee/spec/javascripts/feature_flags

To improve import order rules

Set import/order, import/no-cycle, and import/no-unresolved
as warn to make this update smoother.

ee/spec/frontend/feature_flags/components/edit_feature_flag_spec.js

 import Vuex from 'vuex';
 import { createLocalVue, shallowMount } from '@vue/test-utils';
 import MockAdapter from 'axios-mock-adapter';
-import { TEST_HOST } from 'spec/test_constants';
 import Form from 'ee/feature_flags/components/form.vue';
 import editModule from 'ee/feature_flags/store/modules/edit';
 import EditFeatureFlag from 'ee/feature_flags/components/edit_feature_flag.vue';
+import { TEST_HOST } from 'spec/test_constants';
 import axios from '~/lib/utils/axios_utils';
 
 const localVue = createLocalVue();

ee/spec/frontend/feature_flags/store/index/mutations_spec.js

 import state from 'ee/feature_flags/store/modules/index/state';
 import mutations from 'ee/feature_flags/store/modules/index/mutations';
 import * as types from 'ee/feature_flags/store/modules/index/mutation_types';
-import { parseIntPagination, normalizeHeaders } from '~/lib/utils/common_utils';
 import { mapToScopesViewModel } from 'ee/feature_flags/store/modules/helpers';
+import { parseIntPagination, normalizeHeaders } from '~/lib/utils/common_utils';
 import { getRequestData, rotateData } from '../../mock_data';
 
 describe('Feature flags store Mutations', () => {