Remove unused std::list include

Author: jasnell

src/workerd/api/web-socket.h

@@ -16,7 +16,6 @@
 #include <kj/compat/http.h>
 
 #include <cstdlib>
-#include <list>
 
 namespace workerd {
 class ActorObserver;

src/workerd/io/trace-stream.h

@@ -6,8 +6,6 @@
 #include <workerd/io/worker-interface.h>
 #include <workerd/util/checked-queue.h>
 
-#include <list>
-
 namespace workerd::tracing {
 
 // A WorkerInterface::CustomEvent implementation used to deliver streaming tail