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/connected-account/standard-objects/connected-account.workspace-entity.ts

@@ -117,6 +117,7 @@ export class ConnectedAccountWorkspaceEntity extends BaseWorkspaceEntity {
     icon: 'IconUserCircle',
     inverseSideTarget: () => WorkspaceMemberWorkspaceEntity,
     inverseSideFieldKey: 'connectedAccounts',
+    onDelete: RelationOnDeleteAction.CASCADE,
   })
   accountOwner: Relation<WorkspaceMemberWorkspaceEntity>;