Honor custom name when TM is registered with the legacy mode. (#38547)

Summary:
Pull Request resolved: #38547

Before this change, when a turbomodule was registered using the `RCT_EXPORT_MODULE()` function using a custom name, the TM was not found in the registry.

With this change, we are adding a fallback that looks in the list of registered TM, asking for the name used by the user to register it.

This fallback is executed only if no other method was successful before as it is more expensive.

## CHANGELOG
[iOS][Fixed] - Honor the custom name choosen by the user to register the module.

Reviewed By: philIip

Differential Revision: D47666848

fbshipit-source-id: 545855de1c398726b9449a0d77af7f1756cca233

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

@@ -794,9 +794,25 @@ - (Class)_getModuleClassFromName:(const char *)moduleName
     moduleClass = [_delegate getModuleClassFromName:moduleName];
   }
 
-  if (!moduleClass) {
-    moduleClass = getFallbackClassFromName(moduleName);
+  if (moduleClass != nil) {
+    return moduleClass;
+  }
+
+  moduleClass = getFallbackClassFromName(moduleName);
+  if (moduleClass != nil) {
+    return moduleClass;
   }
+
+  // fallback on modules registered throught RCT_EXPORT_MODULE with custom names
+  NSString *objcModuleName = [NSString stringWithUTF8String:moduleName];
+  NSArray<Class> *modules = RCTGetModuleClasses();
+  for (Class current in modules) {
+    NSString *currentModuleName = [current moduleName];
+    if ([objcModuleName isEqualToString:currentModuleName]) {
+      return current;
+    }
+  }
+
   return moduleClass;
 }