feat: removed ora staff notification settings banner (#421)

Co-authored-by: Ayesha Waris <ayesha.waris@192.168.10.31>

Author: ayesha-waris

src/App.jsx

@@ -9,7 +9,6 @@ import { LearningHeader as Header } from '@edx/frontend-component-header';
 import { selectors } from 'data/redux';
 
 import DemoWarning from 'containers/DemoWarning';
-import NotificationsBanner from 'containers/NotificationsBanner';
 import ListView from 'containers/ListView';
 
 import './App.scss';
@@ -26,7 +25,6 @@ export const App = ({ courseMetadata, isEnabled }) => (
         data-testid="header"
       />
       {!isEnabled && <DemoWarning />}
-      <NotificationsBanner />
       <main data-testid="main">
         <ListView />
       </main>

src/__snapshots__/App.test.jsx.snap

@@ -11,7 +11,6 @@ exports[`App router component snapshot: disabled (show demo warning) 1`] = `
       data-testid="header"
     />
     <DemoWarning />
-    <NotificationsBanner />
     <main
       data-testid="main"
     >
@@ -32,7 +31,6 @@ exports[`App router component snapshot: enabled 1`] = `
       courseTitle="course-title"
       data-testid="header"
     />
-    <NotificationsBanner />
     <main
       data-testid="main"
     >