Potential mismatch between spanner client features we want to use and features we request

We saw a log message in production that looks like this:

```
{"level":"warn","time":"2025-11-17T17:05:35Z","time":"2025-11-17T17:05:35Z","message":"DirectPath is disabled. To enable, please set the EnableDirectPath option along with the EnableDirectPathXds option."}
```

This seems like it could indicate that we're trying to use a `DirectPath` feature without configuring the client to use it.