can't add consumer to CDC stream with query service

Reproduce:

```
DROP TABLE IF EXISTS t;

CREATE TABLE t (id Int64, PRIMARY KEY(id));

ALTER TABLE t
ADD CHANGEFEED cdc WITH (
 FORMAT='JSON',
 MODE='NEW_AND_OLD_IMAGES'
);


ALTER TOPIC `t/cdc`
ADD CONSUMER c;
```

Error:
```
Error path 'local/t/cdc' is not compatible scheme object
Code: 500040
```

Expected behavior: table with cdc topic and consumer without errors.
