Fix merge regressions after jetstream parity merge

src/NATS.Server/Monitoring/VarzHandler.cs

@@ -138,7 +138,6 @@ public sealed class VarzHandler : IDisposable
                         Consumers = _server.JetStreamConsumers,
                     },
                 },
-                Mqtt = BuildMqttVarz(),
             };
         }
         finally

src/NATS.Server/Protocol/ClientCommandMatrix.cs

@@ -2,14 +2,14 @@ namespace NATS.Server.Protocol;
 
 public sealed class ClientCommandMatrix
 {
-    public bool IsAllowed(ClientKind kind, string? op)
+    public bool IsAllowed(global::NATS.Server.ClientKind kind, string? op)
     {
         if (string.IsNullOrWhiteSpace(op))
             return true;
 
         return (kind, op.ToUpperInvariant()) switch
         {
-            (ClientKind.Router, "RS+") => true,
+            (global::NATS.Server.ClientKind.Router, "RS+") => true,
             (_, "RS+") => false,
             _ => true,
         };

src/NATS.Server/Protocol/ClientKind.cs

@@ -1,12 +0,0 @@
-namespace NATS.Server.Protocol;
-
-public enum ClientKind
-{
-    Client,
-    Router,
-    Gateway,
-    Leaf,
-    System,
-    JetStream,
-    Account,
-}