Arbitrary `include` is allowed by type checking even when the model has no relation field.

```zmodel
model Dummy {
    id   Int    @id @default(autoincrement())
    name String
}
```

Then the below query code could pass the typechecking, and runtime will throw error:
```ts
  const dummies = await db.dummy.findMany({
    include: {
      abcdefg: true,
    },
  });
```

For this case it's better to not allow to use `include` at all, which is consistent with v2 behavior