Delete CppGC teardown code

V8 is doing the teardown now, so there is no need for node to do it.

Author: gahaas

src/env.cc

@@ -602,14 +602,6 @@ IsolateData::IsolateData(Isolate* isolate,
   }
 }
 
-IsolateData::~IsolateData() {
-  if (cpp_heap_ != nullptr) {
-    // The CppHeap must be detached before being terminated.
-    isolate_->DetachCppHeap();
-    cpp_heap_->Terminate();
-  }
-}
-
 // Deprecated API, embedders should use v8::Object::Wrap() directly instead.
 void SetCppgcReference(Isolate* isolate,
                        Local<Object> object,

src/env.h

@@ -155,7 +155,6 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
       ArrayBufferAllocator* node_allocator = nullptr,
       const EmbedderSnapshotData* embedder_snapshot_data = nullptr,
       std::shared_ptr<PerIsolateOptions> options = nullptr);
-  ~IsolateData();
 
   SET_MEMORY_INFO_NAME(IsolateData)
   SET_SELF_SIZE(IsolateData)
@@ -258,7 +257,6 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
   const SnapshotData* snapshot_data_;
   std::optional<SnapshotConfig> snapshot_config_;
 
-  std::unique_ptr<v8::CppHeap> cpp_heap_;
   std::shared_ptr<PerIsolateOptions> options_;
   worker::Worker* worker_context_ = nullptr;
   PerIsolateWrapperData* wrapper_data_;