Federation example not working out-of-the-box

### What happened?
I cloned the gqlgen repo and tried the federation example. I get an error with the federation example after starting up the services and also the federation gateway:

### What did you expect?
I expected the example to work, I didn't change any code and was just following the tutorial here: https://gqlgen.com/recipes/federation/

### Minimal graphql.schema and models to reproduce
The ```./accounts/schema.graphqls``` file seems to be missing the reviews field? I'm not sure yet if this is the issue:

```
extend type Query {
me: User
}

type EmailHost @key(fields: "id") {
id: String!
name: String!
}

type User @key(fields: "id") {
id: ID!
host: EmailHost!
email: String!
username: String!
}
```

### versions
- `go run github.com/99designs/gqlgen version`? 0.16.0
- `go version`? go1.18 linux/amd64