Maven clean does not remove node_modules folder

When running the mvn clean command, the node_modules folder is not removed.

We can argue that this is expected, as the current clean command removes the result of the build, it does not remove the artifacts. But for our frontend-build, the result of the Maven build is actually the creation of the node_modules folder.

We can either add the node_modules folder to the clean plugin by default, or add it to a the clean profile, which is already defined in the project POM.