Cleanup server launch, misc. MP consts, and register Editor Spawnable assets server side

Code/Framework/AzCore/AzCore/Asset/AssetCommon.h

@@ -308,6 +308,8 @@ namespace AZ
             Asset(AssetLoadBehavior loadBehavior = AssetLoadBehavior::Default);
             /// Create an asset from a valid asset data (created asset), might not be loaded or currently loading.
             Asset(AssetData* assetData, AssetLoadBehavior loadBehavior);
+            /// Create an asset from a valid asset data (created asset) and set the asset id for both, might not be loaded or currently loading.
+            Asset(const AZ::Data::AssetId& id, AssetData* assetData, AssetLoadBehavior loadBehavior);
             /// Initialize asset pointer with id, type, and hint. No data construction will occur until QueueLoad is called.
             Asset(const AZ::Data::AssetId& id, const AZ::Data::AssetType& type, const AZStd::string& hint = AZStd::string());
 
@@ -788,6 +790,17 @@ namespace AZ
             SetData(assetData);
         }
 
+        //=========================================================================
+        template<class T>
+        Asset<T>::Asset(const AssetId& id, AssetData* assetData, AssetLoadBehavior loadBehavior)
+            : m_assetId(id)
+            , m_assetType(azrtti_typeid<T>())
+            , m_loadBehavior(loadBehavior)
+        {
+            assetData->m_assetId = id;
+            SetData(assetData);
+        }
+
         //=========================================================================
         template<class T>
         Asset<T>::Asset(const AssetId& id, const AZ::Data::AssetType& type, const AZStd::string& hint)

Code/Framework/AzToolsFramework/AzToolsFramework/Entity/PrefabEditorEntityOwnershipInterface.h

@@ -46,6 +46,8 @@ namespace AzToolsFramework
 
         virtual Prefab::InstanceOptionalReference GetRootPrefabInstance() = 0;
 
+        //! Get all Assets generated by Prefab processing when entering Play-In Editor mode (Ctrl+G)
+        //! /return The vector of Assets generated by Prefab processing
         virtual const AZStd::vector<AZ::Data::Asset<AZ::Data::AssetData>>& GetPlayInEditorAssetData() = 0;
 
         virtual bool LoadFromStream(AZ::IO::GenericStream& stream, AZStd::string_view filename) = 0;