NPM can duplicate Packages::Package entries

Uploading 2 times the same package (same project, same name, same version) creates a new Packages::Package for npm, instead with mvn we add the files on the already existing Packages::Package

As you can see from the screenshow @work/pkgs 1.0.0 was created 3 times, and com/mycompany/app/my-app 1.0 only once.

Checking inside com/mycompany/app/my-app 1.0 we can see several uploads.