Mock timeago to prevent failing snapshots

ee/spec/frontend/threat_monitoring/components/__snapshots__/network_policy_list_spec.js.snap

@@ -90,7 +90,7 @@ exports[`NetworkPolicyList component renders policies table 1`] = `
       >
         <div>
           
-      4 months ago
+      2 weeks ago
     
         </div>
       </td>

ee/spec/frontend/threat_monitoring/components/network_policy_list_spec.js

 import { mount } from '@vue/test-utils';
+import { GlTable } from '@gitlab/ui';
+import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import createStore from 'ee/threat_monitoring/store';
 import NetworkPolicyList from 'ee/threat_monitoring/components/network_policy_list.vue';
-import { GlTable } from '@gitlab/ui';
 import { PREDEFINED_NETWORK_POLICIES } from 'ee/threat_monitoring/constants';
-import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
-
 import { mockPoliciesResponse } from '../mock_data';
 
+jest.mock('timeago.js', () => ({
+  format: jest.fn().mockReturnValue('2 weeks ago'),
+  register: jest.fn(),
+}));
+
 const mockData = mockPoliciesResponse.map(policy => convertObjectPropsToCamelCase(policy));
 
 describe('NetworkPolicyList component', () => {