src: remove unused PromiseWrap-related code

PromiseWrap has been removed in
nodejs#39135 and we do not have any
internal object setting the internal field at 0 as a promise
(we always set the first field as an aligned pointer to
the embedder ID). As result GetAssignedPromiseWrapAsyncId()
always just returns AsyncWrap::kInvalidAsyncId and turn
the removed block into noops. So the block just can be removed.

src/node_task_queue.cc

@@ -43,28 +43,6 @@ static Maybe<double> GetAssignedPromiseAsyncId(Environment* env,
       : v8::Just(AsyncWrap::kInvalidAsyncId);
 }
 
-static Maybe<double> GetAssignedPromiseWrapAsyncId(Environment* env,
-                                                   Local<Promise> promise,
-                                                   Local<Value> id_symbol) {
-  // This check is imperfect. If the internal field is set, it should
-  // be an object. If it's not, we just ignore it. Ideally v8 would
-  // have had GetInternalField returning a MaybeLocal but this works
-  // for now.
-  Local<Value> promiseWrap = promise->GetInternalField(0).As<Value>();
-  if (promiseWrap->IsObject()) {
-        Local<Value> maybe_async_id;
-    if (!promiseWrap.As<Object>()->Get(env->context(), id_symbol)
-        .ToLocal(&maybe_async_id)) {
-      return v8::Just(AsyncWrap::kInvalidAsyncId);
-    }
-    return maybe_async_id->IsNumber()
-        ? maybe_async_id->NumberValue(env->context())
-        : v8::Just(AsyncWrap::kInvalidAsyncId);
-  } else {
-      return v8::Just(AsyncWrap::kInvalidAsyncId);
-  }
-}
-
 void PromiseRejectCallback(PromiseRejectMessage message) {
   static std::atomic<uint64_t> unhandledRejections{0};
   static std::atomic<uint64_t> rejectionsHandledAfter{0};
@@ -122,17 +100,6 @@ void PromiseRejectCallback(PromiseRejectMessage message) {
   if (!GetAssignedPromiseAsyncId(env, promise, env->trigger_async_id_symbol())
           .To(&trigger_async_id)) return;
 
-  if (async_id == AsyncWrap::kInvalidAsyncId &&
-      trigger_async_id == AsyncWrap::kInvalidAsyncId) {
-    // That means that promise might be a PromiseWrap, so we'll
-    // check there as well.
-    if (!GetAssignedPromiseWrapAsyncId(env, promise, env->async_id_symbol())
-              .To(&async_id)) return;
-    if (!GetAssignedPromiseWrapAsyncId(
-          env, promise, env->trigger_async_id_symbol())
-              .To(&trigger_async_id)) return;
-  }
-
   if (async_id != AsyncWrap::kInvalidAsyncId &&
       trigger_async_id != AsyncWrap::kInvalidAsyncId) {
     env->async_hooks()->push_async_context(