Add error handling in InspectorPackagerConnection::connect() (#56713)

Summary:
Pull Request resolved: #56713

Fix a SIGSEGV crash that can occur during WebSocket connection in the React Native JS inspector when `JCxxInspectorPackagerConnectionDelegateImpl::connectWebSocket()` fails (for example, due to allocation failure when constructing the WebSocket delegate hybrid object, or a JNI exception thrown from the Java side).

Previously `InspectorPackagerConnection::Impl::connect()` had no error handling around the `connectWebSocket` call — any exception (`std::bad_alloc`, `JniException`, etc.) would propagate unhandled and terminate the process.

### Changes
1. **`InspectorPackagerConnection.cpp`**: Wrap `connectWebSocket` in try-catch. On failure, log the error, reset the WebSocket, and trigger `reconnect()` (existing 2-second retry mechanism). This is consistent with how other error paths in the same class already handle failures (e.g., `didFailWithError` and `didClose` both call `reconnect()`).
2. **`JCxxInspectorPackagerConnectionDelegateImpl.cpp`**: Add a null check on the JNI return value before calling `wrapInUniquePtr()` to prevent a null dereference if the Java method returns null.

Changelog:
[General][Fixed] - Handle exceptions thrown during WebSocket connect in `InspectorPackagerConnection` to avoid native crashes when the JS inspector fails to connect
[Android][Fixed] - Add null check on JNI return value in `JCxxInspectorPackagerConnectionDelegateImpl::connectWebSocket` to prevent null dereference

Reviewed By: huntie

Differential Revision: D100956267

fbshipit-source-id: e6e7ffa99c600ab437069a5344b4c13ad109eca3

Author: shubhamksavita

packages/react-native/ReactAndroid/src/main/jni/react/devsupport/JCxxInspectorPackagerConnectionDelegateImpl.cpp

@@ -30,6 +30,9 @@ JCxxInspectorPackagerConnectionDelegateImpl::connectWebSocket(
               "connectWebSocket");
   auto jWebSocket = method(
       self(), url, make_global(JWebSocketDelegate::newObjectCxxArgs(delegate)));
+  if (!jWebSocket) {
+    return nullptr;
+  }
   return jWebSocket->wrapInUniquePtr();
 }
 

packages/react-native/ReactCommon/jsinspector-modern/InspectorPackagerConnection.cpp

@@ -341,9 +341,12 @@ void InspectorPackagerConnection::Impl::connect() {
     webSocket_ = delegate_->connectWebSocket(url_, weak_from_this());
   } catch (const std::exception& e) {
     LOG(ERROR) << "Failed to create WebSocket connection: " << e.what();
-    reconnect();
+    webSocket_.reset();
   } catch (...) {
     LOG(ERROR) << "Failed to create WebSocket connection: unknown error";
+    webSocket_.reset();
+  }
+  if (!webSocket_ && !closed_) {
     reconnect();
   }
 }