ensure get slots parsing deals with unstable slots

Author: vazois

libs/host/GarnetServer.cs

@@ -438,12 +438,13 @@ private void InternalDispose()
             for (var i = 0; i < servers.Length; i++)
                 servers[i]?.Close();
 
-            // Phase 2: Dispose the provider (storage engine shutdown — may take time).
-            Provider?.Dispose();
-
-            // Phase 3: Drain active handlers and clean up remaining resources.
+            // Phase 2: Drain active handlers and clean up remaining resources.
             for (var i = 0; i < servers.Length; i++)
                 servers[i]?.Dispose();
+
+            // Phase 3: Dispose the provider (storage engine shutdown — may take time).
+            Provider?.Dispose();
+
             subscribeBroker?.Dispose();
             storeEpoch?.Dispose();
             aofEpoch?.Dispose();

test/Garnet.test.cluster/ClusterTestUtils.cs

@@ -1530,6 +1530,10 @@ public List<int> GetOwnedSlotsFromNode(IPEndPoint endPoint, ILogger logger)
             {
                 for (int i = (int)ClusterInfoTag.SLOT; i < nodeInfo.Length; i++)
                 {
+                    // Skip migration/import markers like [slot->-nodeId] and [slot-<-nodeId]
+                    if (nodeInfo[i].StartsWith('['))
+                        continue;
+
                     var range = nodeInfo[i].Split('-');
                     if (!ushort.TryParse(range[0], out var slotStart))
                         Assert.Fail($"GetOwnedSlotsFromNode: {range[0]}");