Fix missing on delete cascade for relation (#11725)

Follow up from https://github.com/twentyhq/twenty/pull/10217
Adding onDelete action on Many_to_one sides

packages/twenty-server/src/modules/person/standard-objects/person.workspace-entity.ts

@@ -185,6 +185,7 @@ export class PersonWorkspaceEntity extends BaseWorkspaceEntity {
     icon: 'IconBuildingSkyscraper',
     inverseSideTarget: () => CompanyWorkspaceEntity,
     inverseSideFieldKey: 'people',
+    onDelete: RelationOnDeleteAction.SET_NULL,
   })
   @WorkspaceIsNullable()
   company: Relation<CompanyWorkspaceEntity> | null;