RTDB exposes wrong error message when performing `get` on a path blocked by security rules

### Description

When calling `getData` on a path, say `/a/b`, and `/` is set to deny reads, the SDK responds with
```
Unable to get latest value for query FQuerySpec (path: /a/b, params: {
}), client offline with no active listeners and no matching disk cache entries
```
Instead of sending back this opaque error message, we should read the response that comes back from the server after the `get`

Relevant Code:
https://github.com/firebase/firebase-ios-sdk/blob/a885d5e023b04273fcce525e1ae236283845d774/FirebaseDatabase/Sources/Core/FRepo.m#L548C14-L548C14

### Reproducing the issue

_No response_

### Firebase SDK Version

10.9

### Xcode Version

14.3

### Installation Method

Swift Package Manager

### Firebase Product(s)

Database

### Targeted Platforms

All

### Relevant Log Output

_No response_

### If using Swift Package Manager, the project's Package.resolved

_No response_

### If using CocoaPods, the project's Podfile.lock

_No response_