Remove MessageQueueThreadHandler.java to fix CI (facebook#49613)

Summary:
MessageQueueThreadHandler was migrated to Kotlin in facebook#49583 but during merging the Java file was kept, this is currently breaking the `build-android` action in CI. [See this action for example](https://github.com/facebook/react-native/actions/runs/13472084782/job/37646841097?pr=49607)

## Changelog:

[INTERNAL] - Remove MessageQueueThreadHandler.java implementation to fix CI

Pull Request resolved: facebook#49613

Test Plan:
```bash
yarn build-android
```

Reviewed By: fkgozali

Differential Revision: D70059045

Pulled By: arushikesarwani94

fbshipit-source-id: 93665a8ac4ccc1cb1b03908179e2fcd12c61b3dd

Author: mateoguzmana

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -1609,7 +1609,7 @@ public abstract interface class com/facebook/react/bridge/queue/MessageQueueThre
 	public abstract fun runOnQueue (Ljava/lang/Runnable;)Z
 }
 
-public class com/facebook/react/bridge/queue/MessageQueueThreadHandler : android/os/Handler {
+public final class com/facebook/react/bridge/queue/MessageQueueThreadHandler : android/os/Handler {
 	public fun <init> (Landroid/os/Looper;Lcom/facebook/react/bridge/queue/QueueThreadExceptionHandler;)V
 	public fun dispatchMessage (Landroid/os/Message;)V
 }