Test non-ascii utf-8 character team member name upload. (#24009)

* remove old_format reference in teams config

* validate uploaded character values for team csv upload

Co-authored-by: Ben Warzeski <benwarzeski@edX-C02CD0HCLVDM.cable.rcn.com>

lms/djangoapps/teams/tests/test_views.py

@@ -2840,3 +2840,27 @@ class TestBulkMembershipManagement(TeamAPITestCase):
             response_text['errors'],
             ['User name/email/external key: a_user_external_key_invalid does not exist.']
         )
+
+    def test_upload_non_ascii(self):
+        csv_content = 'user,mode,topic_0' + '\n'
+        team_name = '著文企臺個'
+        user_name = '著著文企臺個文企臺個'
+        self.create_and_enroll_student(username=user_name)
+        csv_content += '{},audit,{}'.format(user_name, team_name)
+        csv_file = SimpleUploadedFile('test_file.csv', csv_content.encode('utf8'), content_type='text/csv')
+        self.client.login(username=self.users['course_staff'].username, password=self.users['course_staff'].password)
+        self.make_call(
+            reverse('team_membership_bulk_management', args=[self.good_course_id]),
+            201, method='post',
+            data={'csv': csv_file},
+            user='staff'
+        )
+        team = self.users[user_name].teams.first()
+        self.assertEqual(
+            team.name,
+            team_name
+        )
+        self.assertEqual(
+            [user.username for user in team.users.all()],
+            [user_name]
+        )