Realtime config is not updated after setting user property or custom signals

### Description

After successful login, our app sets user property and custom signals. However, the new config update didn't recieved. It used to work before.

### Reproducing the issue

1, start remote config service and add config update liseners
2, user login
3, upload user properties and custom singals
4, waiting for config updates

### Firebase SDK Version

12.12

### Xcode Version

26.4

### Installation Method

Swift Package Manager

### Firebase Product(s)

Remote Config

### Targeted Platforms

iOS

### Relevant Log Output

```shell

```

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

Expand Package.resolved snippet

```json

Replace this line with the contents of your Package.resolved.

```

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

Expand Podfile.lock snippet

```yml

Replace this line with the contents of your Podfile.lock!

```

Start by reproducing the reported sequence: enable Remote Config realtime update listeners, log in, upload user properties and custom signals, and wait for an update. Review the Remote Config realtime listener flow and the seven- comment discussion for context. Done means the new config update is received after those properties or signals are set.

Written by the indexing model from the issue text.