Replace rimraf with del-cli

[tjementum]

Summary & Motivation

Replace rimraf with del-cli to remove content of WebApp/dist folders. When building the frontend SPA, it's important to not delete the dist folder but only the content, because of a race condition when starting the .NET API, which may fail when trying to read WebApp/dist/index.html. rimraf seems to work differently on macOS and Windows, whereas del-cli works consistently on both operating systems.

Checklist

• [x] I have added a Label to the pull-request
• [x] I have added tests, and done manual regression tests
• [x] I have updated the documentation, if necessary

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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