http, async_hooks: remove unneeded reference to wrapping resource

Remove the reference from handle to the unique/wrapping resource
ReusedHandle as there is meanwhile a strong reference for all async
resources in place via AsyncWarp::resource_.

PR-URL: #32054
Refs: #30959
Refs: #30196
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/_http_agent.js

@@ -45,18 +45,10 @@ const kOnKeylog = Symbol('onkeylog');
 // ClientRequest.onSocket(). The Agent is now *strictly*
 // concerned with managing a connection pool.
 
-const kReusedHandle = Symbol('kReusedHandle');
 class ReusedHandle {
   constructor(type, handle) {
     this.type = type;
     this.handle = handle;
-    // We need keep the resource object alive from this object, because
-    // domains rely on GC of the resource object for lifetime tracking.
-    // TODO(addaleax): This should really apply to all uses of
-    // AsyncWrap::AsyncReset() when the resource is not the AsyncWrap object
-    // itself. However, HTTPClientAsyncResource and HTTPServerAsyncResource
-    // hold on to other objects, inhibiting GC.
-    handle[kReusedHandle] = this;
   }
 }