Revert batching for mount operations accumulated before root view att…

…ached

Summary:
Changelog: [internal]

Batching operations at this layer was wrong because these are the operations that were already flushed by the mounting layer but were accumulated in `SurfaceMountingManager` because the root view wasn't created.

These operations should be executed before anything else that's scheduled in the `MountItemDispatcher`, so we should never batch them. The problem this was trying to solve is solved in a different way in D57968937.

This was gated so this shouldn't affect any current usages.

Differential Revision: D57968939

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -214,14 +214,7 @@ public class FabricUIManager
         public void executeItems(Queue<MountItem> items) {
           // This executor can be technically accessed before the dispatcher is created,
           // but if that happens, something is terribly wrong
-          if (ReactNativeFeatureFlags.forceBatchingMountItemsOnAndroid()) {
-            for (MountItem mountItem : items) {
-              mMountItemDispatcher.addMountItem(mountItem);
-            }
-            mMountItemDispatcher.tryDispatchMountItems();
-          } else {
-            mMountItemDispatcher.dispatchMountItems(items);
-          }
+          mMountItemDispatcher.dispatchMountItems(items);
         }
       };