sonar-ui-common was a shared code base between the SonarCloud and SonarQube project. The SonarCloud team removed the dependency to this library and integrated the functionality in their code base.
Therefore the ownership of this dependency moved to the SonarQube team and the frontend devs decided to follow the SonarCloud approach.
This dependency does not follow the Artifact Management guidelines. It was decided to remove the dependency, instead of fixing the Artifact Management.