fix: add microtask runner and fix promise test (#15071)

* fix: Promise resolution and unit test

* Update to use microtask runner

* Address review

atom/common/promise_util.cc

@@ -21,8 +21,7 @@ v8::Maybe<bool> Promise::RejectWithErrorMessage(const std::string& string) {
   v8::Local<v8::String> error_message =
       v8::String::NewFromUtf8(isolate(), string.c_str());
   v8::Local<v8::Value> error = v8::Exception::Error(error_message);
-  return GetInner()->Reject(isolate()->GetCurrentContext(),
-                            mate::ConvertToV8(isolate(), error));
+  return Reject(error);
 }
 
 v8::Local<v8::Promise> Promise::GetHandle() const {

atom/common/promise_util.h

@@ -32,6 +32,8 @@ class Promise : public base::RefCounted<Promise> {
                               v8::Undefined(isolate()));
   }
 
+  // Promise resolution is a microtask
+  // We use the MicrotasksRunner to trigger the running of pending microtasks
   template <typename T>
   v8::Maybe<bool> Resolve(const T& value) {
     return GetInner()->Resolve(isolate()->GetCurrentContext(),