feat: simplification of default-value specification in FieldMetadata (#4592)

* feat: wip refactor default-value

* feat: health check to migrate default value

* fix: tests

* fix: refactor defaultValue to make it more clean

* fix: unit tests

* fix: front-end default value

packages/twenty-server/src/modules/activity/standard-objects/activity.object-metadata.ts

@@ -47,7 +47,7 @@ export class ActivityObjectMetadata extends BaseObjectMetadata {
     label: 'Type',
     description: 'Activity type',
     icon: 'IconCheckbox',
-    defaultValue: { value: 'Note' },
+    defaultValue: "'Note'",
   })
   type: string;