Bump tmp and react-scripts in /web-client

Removes [tmp](https://github.com/raszi/node-tmp). It's no longer used after updating ancestor dependency [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts). These dependencies need to be updated together.


Removes `tmp`

Updates `react-scripts` from 3.4.1 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-3.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/[email protected]/packages/react-scripts)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 
  dependency-type: indirect
- dependency-name: react-scripts
  dependency-version: 5.0.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]