Improve Sonar NOS coverage and extract a report

SonarCloud:
https://sonarcloud.io/dashboard?id=com.nuxeo.nos%3Aparent hasn't been run since Jan 29th; and we need to investigate why.

As well as improving code quality from E to at least D.

In the end, we must have a document highlighting a key metrics to share with a customer

• showing code smells trend
• Project reliability