Data Connect Swift Generation Struct Property Name Conflict

### [REQUIRED] Environment info

**firebase-tools:15.14.0**

**Platform:macOS**

### [REQUIRED] Test case

Starting with the codelab for iOS: https://firebase.google.com/codelabs/firebase-dataconnect-ios#0

### [REQUIRED] Steps to reproduce
1. Modify the Review table to have another property that is also a User:
```
# Reviews is a join table between User and Movie.
# It has a composite primary keys `userUid` and `movieId`.
# A user can leave reviews for many movies. A movie can have reviews from many users.
# User <-> Review is a one-to-many relationship
# Movie <-> Review is a one-to-many relationship
# Movie <-> User is a many-to-many relationship
type Review @table(name: "Reviews", key: ["movie", "user"]) {
user: User!
otherUser: User!
# The user field adds the following foreign key field. Feel free to uncomment and customize it.
# userUid: String!
movie: Movie!
# The movie field adds the following foreign key field. Feel free to uncomment and customize it.
# movieId: UUID!
rating: Int
reviewText: String
reviewDate: Date! @default(expr: "request.time")
}
```
and correct the AddReview query:
```
mutation AddReview($movieId: UUID!, $rating: Int!, $reviewText: String!)
@auth(level: USER) {
review_upsert(
data: {
userId_expr: "auth.uid"
otherUserId_expr: "auth.uid"
movieId: $movieId
rating: $rating
reviewText: $reviewText
# reviewDate defaults to today in the schema. No need to set it manually.
}
)
}
```
2. Create the following query:
```
query ListReviewsRepro @auth(level: PUBLIC) {
reviews {
rating
reviewText
user { id username }
otherUser { id username }
}
}
```
3. Generate the sdk for swift

### [REQUIRED] Expected behavior

The User structs underneath the ListReviewsReproQuery class should have unique names like generating for Android creates:
```
@kotlinx.serialization.Serializable
public data class User(

val id: String,
val username: String
) {


}

@kotlinx.serialization.Serializable
public data class OtherUser(

val id: String,
val username: String
) {


}
```

### [REQUIRED] Actual behavior

The same name is given to struct for both the user and other user properties with the ListReviewsReproQuery. This prevents the iOS code from being able to build