refactor: remove redundant user exclusion logic for improved clarity

Author: wxg0103

apps/users/serializers/user.py

@@ -512,10 +512,6 @@ def get_user_members(self, workspace_id):
             user_role_relations = (
                 user_role_relation_model.objects
                 .filter(workspace_id=workspace_id, role__type='USER')
-                .exclude(user__in=user_role_relation_model.objects
-                         .filter(workspace_id=workspace_id)
-                         .exclude(role__type='USER')
-                         .values_list('user', flat=True))
                 .select_related('role', 'user')
             )
             user_dict = {}