src: use ZCtxt as a source for v8::Isolates
Other methods like After already use ZCtxt as the source for Environment/ v8::Isolate objects, this commit applies the same style to the other missing methods (After sync and Write)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Other methods like After already use ZCtxt as the source for Environment/ v8::Isolate objects, this commit applies the same style to the other missing methods (After sync and Write)