Fix hardcoded package names in the download models

Recently, a package was removed from release train which ended up breaking some of the seralization of our downloads source. We should change this data to be more flexible and free form to better support these cases. While having hardcoded is clearer for documentation and manipulation, with a source that can freely change we should also be more flexible.

In the short term, a patch will be made to resolve the serialization issue, with a longer term fix coming later to remove hardcoding of package names.