user_groups: Track acting user for do_update_user_group_name.

This is a prep-commit for populating RealmAuditLogs for changes made to
UserGroup.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

zerver/actions/user_groups.py

@@ -134,7 +134,9 @@ def do_send_user_group_update_event(user_group: UserGroup, data: Dict[str, str])
     send_event(user_group.realm, event, active_user_ids(user_group.realm_id))
 
 
-def do_update_user_group_name(user_group: UserGroup, name: str) -> None:
+def do_update_user_group_name(
+    user_group: UserGroup, name: str, *, acting_user: Optional[UserProfile]
+) -> None:
     try:
         user_group.name = name
         user_group.save(update_fields=["name"])

zerver/tests/test_events.py

@@ -1286,7 +1286,9 @@ class NormalActionsTest(BaseAction):
 
         # Test name update
         backend = UserGroup.objects.get(name="backend")
-        events = self.verify_action(lambda: do_update_user_group_name(backend, "backendteam"))
+        events = self.verify_action(
+            lambda: do_update_user_group_name(backend, "backendteam", acting_user=None)
+        )
         check_user_group_update("events[0]", events[0], "name")
 
         # Test description update

zerver/views/user_groups.py

@@ -71,7 +71,7 @@ def edit_user_group(
     user_group = access_user_group_by_id(user_group_id, user_profile)
 
     if name != user_group.name:
-        do_update_user_group_name(user_group, name)
+        do_update_user_group_name(user_group, name, acting_user=user_profile)
 
     if description != user_group.description:
         do_update_user_group_description(user_group, description)