Adjust NPM package finder to exclude projects that don't have package registry enabled.
Context
After we implemented the changes for Check permission to read a package when return ... (#408496 - closed) the package finder doesn't exclude public projects that don't have package registry enabled and still returns the packages from those projects.
Solution
Filter out the projects that don't have packages_enabled
when searching for packages in a namespace.
Edited by Dzmitry (Dima) Meshcharakou