Make DatabaseSchema notifications stateful

src/Umbraco.Core/Events/CancelableNotification.cs

@@ -1,6 +1,6 @@
 namespace Umbraco.Cms.Core.Events
 {
-    public class CancelableNotification : ICancelableNotification
+    public class CancelableNotification : StatefulNotification, ICancelableNotification
     {
         public bool Cancel { get; set; }
         public void CancelOperation()

src/Umbraco.Infrastructure/Migrations/Events/DatabaseSchemaCreatedNotification.cs

@@ -2,7 +2,7 @@ using Umbraco.Cms.Core.Events;
 
 namespace Umbraco.Cms.Infrastructure.Migrations.Events
 {
-    internal class DatabaseSchemaCreatedNotification : INotification
+    internal class DatabaseSchemaCreatedNotification : StatefulNotification
     {
 
     }

src/Umbraco.Infrastructure/Migrations/Install/DatabaseSchemaCreator.cs

@@ -146,7 +146,8 @@ namespace Umbraco.Cms.Infrastructure.Migrations.Install
                     CreateTable(false, table, dataCreation);
             }
 
-            FireAfterCreation(new DatabaseSchemaCreatedNotification());
+            DatabaseSchemaCreatedNotification createdNotification = new DatabaseSchemaCreatedNotification().WithStateFrom(creatingNotification);
+            FireAfterCreation(createdNotification);
         }
 
         /// <summary>