Merge branch '12428-pipelines' into 'master'

Removes EE differences for app/assets/javascripts/pipelines/pipeline_details_mediator.js

Closes gitlab-ee#12428

See merge request gitlab-org/gitlab-ce!30085

app/assets/javascripts/pipelines/pipeline_details_mediator.js

 import Visibility from 'visibilityjs';
+import PipelineStore from 'ee_else_ce/pipelines/stores/pipeline_store';
 import Flash from '../flash';
 import Poll from '../lib/utils/poll';
 import { __ } from '../locale';
-import PipelineStore from './stores/pipeline_store';
 import PipelineService from './services/pipeline_service';
 
 export default class pipelinesMediator {