Don't event first_name and last_name.

TNL-2044

common/djangoapps/student/models.py

@@ -374,7 +374,7 @@ def user_post_save_callback(sender, **kwargs):
         user,
         user,
         sender._meta.db_table,
-        excluded_fields=['last_login'],
+        excluded_fields=['last_login', 'first_name', 'last_name'],
         hidden_fields=['password']
     )
 

common/djangoapps/student/tests/test_events.py

@@ -146,3 +146,12 @@ class TestUserEvents(UserSettingsEventTestMixin, TestCase):
         with self.assertRaises(IntegrityError):
             self.user.save()
         self.assert_no_events_were_emitted()
+
+    def test_no_first_and_last_name_events(self):
+        """
+        Verify that first_name and last_name events are not emitted.
+        """
+        self.user.first_name = "Donald"
+        self.user.last_name = "Duck"
+        self.user.save()
+        self.assert_no_events_were_emitted()