Fix crash in RCTExceptionManager (#54550)

Summary:
Pull Request resolved: #54550

# Summary

This diff resolves a crash in RCTExceptionManager by modifying error handling. It fixes the issue by checking if `RCTJSExtraDataKey` and `RCTJSStackTraceKey` are null or not in a dictionary initializer.

Also, `RCTJSExtraDataKey` is marked as nullable but its nullability is not checked.

## Changelog:
[iOS][Fixed] - A Crash when some error information are nil

Reviewed By: javache

Differential Revision: D87140823

fbshipit-source-id: 896d41c5f6559206a6515e402d2a503df6ddb63c

Author: cipolleschi

packages/react-native/React/CoreModules/RCTExceptionsManager.mm

@@ -77,8 +77,11 @@ - (void)reportFatal:(NSString *)message
     RCTTriggerReloadCommandListeners(@"JS Crash Reload");
   } else if (!RCT_DEV) {
     NSString *description = [@"Unhandled JS Exception: " stringByAppendingString:message];
-    NSDictionary *errorInfo =
-        @{NSLocalizedDescriptionKey : description, RCTJSStackTraceKey : stack, RCTJSExtraDataKey : extraDataAsJSON};
+    NSDictionary *errorInfo = @{
+      NSLocalizedDescriptionKey : description,
+      RCTJSStackTraceKey : stack == nil ? (id)kCFNull : stack,
+      RCTJSExtraDataKey : extraDataAsJSON == nil ? (id)kCFNull : extraDataAsJSON
+    };
     RCTFatal([NSError errorWithDomain:RCTErrorDomain code:0 userInfo:errorInfo]);
   }
 }