In SystemWideEnterpriseUserRoleAssignment, Use either applies_to_all_contexts...

In SystemWideEnterpriseUserRoleAssignment, Use either applies_to_all_contexts or enterprise_customer
if they are True or non-null, respectively, in determining the result of get_context(),
but continue to return list of all linked enterprise customer UUIDs if not, (which is the current behavior).
This is a small step on our journey to explicitly defining user-role assignments.