Send notification to cloud user (#6415)

* send subscription expire notification

* optimize code

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Co-authored-by: 孙永强 <11704063+s-yongqiang@user.noreply.gitee.com>

frontend/src/app.js

@@ -8,6 +8,7 @@ import { Utils, isMobile } from './utils/utils';
 import SystemNotification from './components/system-notification';
 import EventBus from './components/common/event-bus';
 import Header from './components/header';
+import SystemUserNotification from './components/system-user-notification';
 import SidePanel from './components/side-panel';
 import ResizeBar from './components/resize-bar';
 import {
@@ -278,6 +279,7 @@ class App extends Component {
     return (
       <React.Fragment>
         <SystemNotification />
+        <SystemUserNotification />
         <Header
           isSidePanelClosed={isSidePanelClosed}
           onCloseSidePanel={this.onCloseSidePanel}