Finish lazilyLoadView

Summary:
This API was used by the old architecture to lazily register/load components:
1. Load a ViewManager's class from the disk
2. Register the ViewManager's class with React Native

See: [RCTUIManager lazilyLoadView](https://github.com/facebook/react-native/blob/822bf52c29729d25b2bfb31655cf773609a9283d/packages/react-native/React/Modules/RCTUIManager.m#L1546-L1591)

The new architecture **does not** support lazy loading of **legacy** modules/components.

Therefore, let's leave this API unimplemented until we decide to implement lazy loading of legacy stuff in new architecture.

Changelog: [Internal]

Reviewed By: sammy-SC

Differential Revision: D52677515

fbshipit-source-id: 8d49a0b54f901a3e9b3e8a9578ebb0c81de522d8

packages/react-native/Libraries/ReactNative/BridgelessUIManager.js

@@ -245,6 +245,11 @@ const UIManagerJSPlatformAPIs = Platform.select({
     },
   },
   ios: {
+    /**
+     * TODO(T174674274): Implement lazy loading of legacy view managers in the new architecture.
+     *
+     * Leave this unimplemented until we implement lazy loading of legacy modules and view managers in the new architecture.
+     */
     lazilyLoadView: (name: string): Object => {
       raiseSoftError('lazilyLoadView');
       return {};

packages/react-native/React/Fabric/Mounting/ComponentViews/LegacyViewManagerInterop/RCTLegacyViewManagerInteropComponentView.mm

@@ -130,6 +130,7 @@ + (BOOL)isSupported:(NSString *)componentName
   }
 
   // Step 3: check if the module has been registered
+  // TODO(T174674274): Implement lazy loading of legacy view managers in the new architecture.
   NSArray<Class> *registeredModules = RCTGetModuleClasses();
   NSMutableDictionary<NSString *, Class> *supportedLegacyViewComponents =
       [RCTLegacyViewManagerInteropComponentView _supportedLegacyViewComponents];

packages/react-native/React/Fabric/Mounting/RCTComponentViewFactory.mm

@@ -135,6 +135,7 @@ - (BOOL)registerComponentIfPossible:(const std::string &)name
   }
 
   // Fallback 3: Try to use Paper Interop.
+  // TODO(T174674274): Implement lazy loading of legacy view managers in the new architecture.
   if (RCTFabricInteropLayerEnabled() && [RCTLegacyViewManagerInteropComponentView isSupported:componentNameString]) {
     RCTLogNewArchitectureValidation(
         RCTNotAllowedInBridgeless,

packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/ReactCommon/RCTTurboModuleManager.mm

@@ -231,6 +231,7 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge
     }
 
     if (RCTTurboModuleInteropEnabled()) {
+      // TODO(T174674274): Implement lazy loading of legacy modules in the new architecture.
       NSMutableDictionary<NSString *, id<RCTBridgeModule>> *legacyInitializedModules = [NSMutableDictionary new];
 
       if ([_delegate respondsToSelector:@selector(extraModulesForBridge:)]) {