Fix view disappearing when switching from WORKSPACE to UNLISTED visibility (#16289)

## Description

When switching a view's visibility from WORKSPACE to UNLISTED, the code
in `view-v2.service.ts` correctly sets `createdByUserWorkspaceId` to the
current user (to prevent the view from disappearing). However, this
property was not included in `FLAT_VIEW_EDITABLE_PROPERTIES`, which
meant:

1. The comparison logic didn't detect the change
2. No update action was created for the property  
3. The value was never persisted to the database
4. The view disappeared because it became UNLISTED with no owner

This fix adds `createdByUserWorkspaceId` to the editable properties so
the change is properly detected and persisted.

Might fix https://github.com/twentyhq/twenty/issues/15955

packages/twenty-server/src/engine/metadata-modules/flat-entity/constant/all-flat-entity-properties-to-compare-and-stringify.constant.ts

@@ -40,7 +40,12 @@ export const ALL_FLAT_ENTITY_PROPERTIES_TO_COMPARE_AND_STRINGIFY = {
     propertiesToStringify: ['standardOverrides'],
   },
   view: {
-    propertiesToCompare: ['key', 'deletedAt', ...FLAT_VIEW_EDITABLE_PROPERTIES],
+    propertiesToCompare: [
+      'key',
+      'deletedAt',
+      'createdByUserWorkspaceId',
+      ...FLAT_VIEW_EDITABLE_PROPERTIES,
+    ],
     propertiesToStringify: [],
   },
   viewField: {