fix: route CDP responses by callback id when sessionId missing (upstream #14975)

Chrome can occasionally respond without a sessionId. Before this fix the
response was dropped because the message id did not exist in the
connection-level callbacks. Now we fall back to scanning per-session
callbacks so the response reaches the session that issued the command.

Upstream: puppeteer/puppeteer#14975

Author: kblok

lib/PuppeteerSharp/Cdp/CdpCDPSession.cs

@@ -144,6 +144,8 @@ public override void Close(string closeReason)
 
     internal bool HasPendingCallbacks() => !_callbacks.IsEmpty;
 
+    internal bool HasCallback(int id) => _callbacks.ContainsKey(id);
+
     internal List<string> GetPendingProtocolErrors()
     {
         var result = new List<string>();

lib/PuppeteerSharp/Cdp/Connection.cs

@@ -368,6 +368,20 @@ private void ProcessIncomingMessage(ConnectionResponse obj)
                 {
                     MessageQueue.Enqueue(callback, obj);
                 }
+                else
+                {
+                    // Chrome can occasionally omit the sessionId on responses. Fall back
+                    // to a per-session callback lookup so the response is routed to the
+                    // session that originally issued the command (upstream #14975).
+                    foreach (var session in _sessions.Values)
+                    {
+                        if (session.HasCallback(obj.Id.Value))
+                        {
+                            session.OnMessage(obj);
+                            break;
+                        }
+                    }
+                }
             }
             else
             {