Show the group when a private model is referenced

[noel]

Is your feature request related to a problem? Please describe. PR 40 shows better error when accessing a private or protected model of the upstream project, however, the group is missing from the message shown.

Node model.great_bay.test_balboa_models attempted to reference node model.balboa.us_population, which is not allowed because the referenced node is private to the '' group.

Describe the solution you'd like Ideally the group of the upstream model is shown in the error like:

Node model.great_bay.test_balboa_models attempted to reference node model.balboa.us_population, which is not allowed because the referenced node is private to the 'marketing' group.

Describe alternatives you've considered None

Additional context None