migrate tasks (#2233)

* migrate task

* cleanup

* NotSupported instead of NotImplemented

* address pr comments
fix function name

* fix default value

* rename base state

* add caching

* return the task when deleting

* build fix

* format

src/ApiService/Tests/OrmModelsTest.cs

@@ -268,7 +268,7 @@ namespace Tests {
                         InstanceName: arg.Item4,
                         WebhookId: arg.Item5
                     )
-            ); ;
+            );
         }
 
         public static Gen<WebhookMessageEventGrid> WebhookMessageEventGrid() {