Migrate JSPointerDispatcher to Kotlin (#56910)

Summary:
Pull Request resolved: #56910

Convert `JSPointerDispatcher` from Java to Kotlin as part of the ongoing React Native Android migration to 100% Kotlin. This follows the same pattern as the recent `JSTouchDispatcher` migration; the class becomes `final` in the API surface (Kotlin default), which is intentional since the class is not part of the supported public API.

Adjacent changes required by the migration:
- Remove `JSPointerDispatcher.java` from the `ReactNoNewJavaDetector` allow-list.
- Regenerate `ReactAndroid.api` to reflect the `final` modifier added to the class and its methods.
- Fix one internal caller (`EmbeddedReactView`) whose `eventDispatcher` was being passed without a null-check; the call is now wrapped in the same `eventDispatcher?.let { ... }` pattern that already guards `jsTouchDispatcher` immediately above it.

Changelog: [Internal]

Reviewed By: javache

Differential Revision: D105847417

fbshipit-source-id: 390ff2f0b4c7413a9f21532749cc934ecfedc4af

Author: cortinico

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

@@ -3319,11 +3319,11 @@ public class com/facebook/react/uimanager/IllegalViewOperationException : com/fa
 	public final fun getView ()Landroid/view/View;
 }
 
-public class com/facebook/react/uimanager/JSPointerDispatcher {
+public final class com/facebook/react/uimanager/JSPointerDispatcher {
 	public fun <init> (Landroid/view/ViewGroup;)V
-	public fun handleMotionEvent (Landroid/view/MotionEvent;Lcom/facebook/react/uimanager/events/EventDispatcher;Z)V
-	public fun onChildEndedNativeGesture ()V
-	public fun onChildStartedNativeGesture (Landroid/view/View;Landroid/view/MotionEvent;Lcom/facebook/react/uimanager/events/EventDispatcher;)V
+	public final fun handleMotionEvent (Landroid/view/MotionEvent;Lcom/facebook/react/uimanager/events/EventDispatcher;Z)V
+	public final fun onChildEndedNativeGesture ()V
+	public final fun onChildStartedNativeGesture (Landroid/view/View;Landroid/view/MotionEvent;Lcom/facebook/react/uimanager/events/EventDispatcher;)V
 }
 
 public final class com/facebook/react/uimanager/JSTouchDispatcher {