[MM-54793] Convert ./components/widgets/separator/notification-separator.tsx to Function Component (#24887)

* Converted Notification Seperator to function component

* Fixed lint error

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/components/widgets/separator/notification-separator.tsx

@@ -5,9 +5,9 @@ import React from 'react';
 import './separator.scss';
 import './notification-separator.scss';
 
-export default class NotificationSeparator extends React.PureComponent<React.PropsWithChildren<any>> {
+type Props = React.PropsWithChildren<any>;
-    public render() {
+
-        const {children} = this.props;
+const NotificationSeparator = ({children}: Props) => {
     return (
         <div
             className='Separator NotificationSeparator'
@@ -21,6 +21,7 @@ export default class NotificationSeparator extends React.PureComponent<React.Pro
             )}
         </div>
     );
-    }
+};
-}
+
+export default React.memo(NotificationSeparator);