Migrate spec/javascripts/cycle_analytics/ to Jest

Closes gitlab-org/gitlab#194224

spec/javascripts/cycle_analytics/banner_spec.js → spec/frontend/cycle_analytics/banner_spec.js

 import Vue from 'vue';
-import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import mountComponent from 'helpers/vue_mount_component_helper';
 import banner from '~/cycle_analytics/components/banner.vue';
 
 describe('Cycle analytics banner', () => {
@@ -36,7 +36,7 @@ describe('Cycle analytics banner', () => {
   });
 
   it('should emit an event when close button is clicked', () => {
-    spyOn(vm, '$emit');
+    jest.spyOn(vm, '$emit').mockImplementation(() => {});
 
     vm.$el.querySelector('.js-ca-dismiss-button').click();
 

spec/javascripts/cycle_analytics/total_time_component_spec.js → spec/frontend/cycle_analytics/total_time_component_spec.js

 import Vue from 'vue';
-import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import mountComponent from 'helpers/vue_mount_component_helper';
 import component from '~/cycle_analytics/components/total_time_component.vue';
 
 describe('Total time component', () => {