Fix eventService memory leaks (#9752)

* fix leak by unbinding event from $rootscope

* destroy more events

* $scope unavailable

* no need to destroy in services as they are singletons

Co-authored-by: nzdev <nzdev@github.com>
Co-authored-by: Nathan Woulfe <nathan@nathanw.com.au>

src/Umbraco.Web.UI.Client/src/views/propertyeditors/nestedcontent/nestedcontent.controller.js

@@ -507,8 +507,10 @@
             vm.showPaste = clipboardService.hasEntriesOfType(clipboardService.TYPES.ELEMENT_TYPE, contentTypeAliases);
         }
 
-        eventsService.on("clipboardService.storageUpdate", checkAbilityToPasteContent);
-
+        var storageUpdate = eventsService.on("clipboardService.storageUpdate", checkAbilityToPasteContent);
+        $scope.$on('$destroy', function () {
+            storageUpdate();
+        });
         var notSupported = [
             "Umbraco.Tags",
             "Umbraco.UploadField",