Fix a race condition where the editor tries to connect to the editor-server before the editor-server is ready (originally discovered on lower-spec Jenkin machines). Change editor-server so that editor waits to receive a EditorServerReadyForInit before trying to send all the level data.

Signed-off-by: Gene Walters <genewalt@amazon.com>

Gems/Multiplayer/Code/Include/Multiplayer/MultiplayerEditorServerBus.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#pragma once
+
+#include <AzCore/EBus/EBus.h>
+
+namespace Multiplayer
+{
+    class MultiplayerEditorServerRequests : public AZ::EBusTraits
+    {
+    public:
+        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
+        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
+
+        virtual void SendEditorServerInitPacket(AzNetworking::IConnection* connection) = 0;
+    };
+    using MultiplayerEditorServerRequestBus = AZ::EBus<MultiplayerEditorServerRequests>;
+} // namespace Multiplayer