Enable social auth users to see other users.

[jctanner]

Users can't see the list of users when trying to add owners to their namespaces.

[jerabekjiri]

LGTM, but I wonder from a security perspective if it's okay to expose information like 'groups,' 'is_superuser,' or 'auth_provider' to all users. Would it make sense to create a custom view for non-superusers with limited information?

[jctanner]

I'd probably create a custom access policy ([here's one for deleting collections](https://github.com/ansible/galaxy_ng/pull/1900/files#diff-2a9ccd7546893821c4c3488d210b249f56e466222f93e8c1d1d7dc8a32e1caaeR262)) to maintain the current access and allow for the new case.

https://github.com/ansible/galaxy_ng/pull/1900/files#diff-2a9ccd7546893821c4c3488d210b249f56e466222f93e8c1d1d7dc8a32e1caaeR262

[jctanner]

Failing test_copy_cv_endpoint works locally with this patch, so ignoring the failure in CI.