Thank you for the logs.
Unfortunately, you’re using a version of SonarQube that is past EOL, and you’re going to have a hard time finding help with it.
You need to upgrade SonarQube at your earliest convenience to either the latest version (8.5.1) or the current LTS (7.9.4).
Coming back to your problem, there is something fishy when analysing the coverage file as depicted by the following log:
[WARNING] Could not resolve 31 file paths in [/var/jenkins_home/workspace/appli-blanche-frontend_develop/coverage/lcov.info], first unresolved path: src/polyfills.ts
Before digging that up further, I let you first upgrading your SonarQube setup, see if that changes anything, and come back to us if the issue persists.