Fix all deprecation warnings generated by Django REST Framework during the unit tests:
* ``The `base_name` argument is pending deprecation in favor of `basename`.`` (86 occurrences)
* `` `detail_route` is deprecated and will be removed in 3.10 in favor of `action`, which accepts a `detail` bool. Use `@action(detail=True)` instead.`` (18 occurrences)
Specifying a namespace in django.conf.urls.include() without providing an app_name is deprecated.
Adding the app_name attribute in the included module.
