[LOCAL][RN][iOS][OldArch] Add missing loadFromSource method in the DefaultRNFactoryDelegate (#49930)

Author: cipolleschi

Diff for: packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm

@@ -140,4 +140,11 @@ - (Class)getModuleClassFromName:(const char *)name
   return nullptr;
 }
 
+- (void)loadSourceForBridge:(RCTBridge *)bridge
+                 onProgress:(RCTSourceLoadProgressBlock)onProgress
+                 onComplete:(RCTSourceLoadBlock)loadCallback
+{
+  [RCTJavaScriptLoader loadBundleAtURL:[self sourceURLForBridge:bridge] onProgress:onProgress onComplete:loadCallback];
+}
+
 @end

Diff for: packages/rn-tester/RNTester/AppDelegate.mm

@@ -80,13 +80,6 @@ - (BOOL)application:(UIApplication *)app
   return [RCTLinkingManager application:app openURL:url options:options];
 }
 
-- (void)loadSourceForBridge:(RCTBridge *)bridge
-                 onProgress:(RCTSourceLoadProgressBlock)onProgress
-                 onComplete:(RCTSourceLoadBlock)loadCallback
-{
-  [RCTJavaScriptLoader loadBundleAtURL:[self sourceURLForBridge:bridge] onProgress:onProgress onComplete:loadCallback];
-}
-
 - (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:(const std::string &)name
                                                       jsInvoker:(std::shared_ptr<facebook::react::CallInvoker>)jsInvoker
 {