View field override (#18572)

## Context
This PR introduces overrides for view fields which will be useful for
page layout FIELDS widgets fields position/groups/visibility override +
restore logic.

packages/twenty-server/src/engine/metadata-modules/view-field/utils/from-flat-view-field-to-view-field-dto.util.ts

@@ -1,3 +1,5 @@
+import { isDefined } from 'twenty-shared/utils';
+
 import { type FlatViewField } from 'src/engine/metadata-modules/flat-view-field/types/flat-view-field.type';
 import { type ViewFieldDTO } from 'src/engine/metadata-modules/view-field/dtos/view-field.dto';
 
@@ -8,6 +10,8 @@ export const fromFlatViewFieldToViewFieldDto = (
 
   return {
     ...rest,
+    isOverridden:
+      isDefined(rest.overrides) && Object.keys(rest.overrides).length > 0,
     createdAt: new Date(createdAt),
     updatedAt: new Date(updatedAt),
     deletedAt: deletedAt ? new Date(deletedAt) : null,