Bump postcss and react-scripts in /frontend

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.31 and updates ancestor dependency [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts). These dependencies need to be updated together.


Updates `postcss` from 7.0.21 to 8.4.31
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.21...8.4.31)

Updates `react-scripts` from 4.0.3 to 5.0.1
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/main/CHANGELOG-4.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/react-scripts@5.0.1/packages/react-scripts)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: react-scripts
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

src/main/resources/static/view/pages/cluster.html

@@ -50,14 +50,7 @@
                 <td class="text-center">{{instance.address}}</td>
                 <td class="text-center">{{instance.brokerVersionDesc}}</td>
                 <td class="text-center">{{instance.putTps.split(' ')[0]| number:2}}</td>
-                <td class="text-center">
-                    <span ng-if="!instance.getTransferedTps || !instance.getTransferedTps.trim()">
-                        {{instance.getTransferredTps.split(' ')[0] | number:2}}
-                    </span>
-                    <span ng-if="instance.getTransferedTps && instance.getTransferedTps.trim()">
-                        {{instance.getTransferedTps.split(' ')[0] | number:2}}
-                    </span>
-                </td>
+                <td class="text-center">{{instance.getTransferedTps.split(' ')[0]| number:2}}</td>
                 <td class="text-center">{{instance.msgPutTotalTodayMorning -
                     instance.msgPutTotalYesterdayMorning}}
                 </td>