Add actual feature flag for this feature rather than piggybacking of the existing feature flag

Author: EmandM

com.unity.netcode.gameobjects/Runtime/Configuration/SessionConfig.cs

@@ -10,9 +10,10 @@ internal class SessionConfig
         public const uint ServerDistributionCompatible = 2;
         public const uint SessionStateToken = 3;
         public const uint NetworkBehaviourSerializationSafety = 4;
+        public const uint FixConnectionFlow = 5;
 
         // The most current session version (!!!!set this when you increment!!!!!)
-        public static uint PackageSessionVersion => NetworkBehaviourSerializationSafety;
+        public static uint PackageSessionVersion => FixConnectionFlow;
 
         internal uint SessionVersion;