MTTB-85: Removed the use of a foreach to stop a GC allocation

Author: samlucas-unity

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -1013,9 +1013,9 @@ private void ExtractNetworkMetrics()
         {
             if (m_NetworkManager.IsServer)
             {
-                var ngoConnectionIds = m_NetworkManager.ConnectedClients.Keys;
-                foreach (var ngoConnectionId in ngoConnectionIds)
+                for (int i=0; i<m_NetworkManager.ConnectedClientsIds.Count; ++i)
                 {
+                    var ngoConnectionId =  m_NetworkManager.ConnectedClientsIds[i];
                     if (ngoConnectionId == 0 && m_NetworkManager.IsHost)
                     {
                         continue;