chore(ecstore): drop the type aliases orphaned by the pagination removal

core/sets.rs declared four local type aliases — ListObjectsV2Info, ListObjectVersionsInfo, ObjectInfoOrErr and WalkOptions — used only by the pool-level pagination pipeline removed earlier in this branch. store/list_objects.rs keeps its own live copies of the same aliases.

They only surface now that #6087 removed the core module's dead_code blanket: on that older base each PR was warning-free on its own, and the combination is what exposes them. Their storage_api_contracts imports go with them.

Ref rustfs/backlog#1823, rustfs/backlog#1821.

crates/ecstore/src/core/sets.rs

@@ -19,7 +19,6 @@ use crate::layout::set_heal::{formats_to_drives_info, new_heal_format_sets};
 use crate::multipart_listing::paginate_multipart_listing;
 use crate::storage_api_contracts::{
     bucket::{BucketInfo, BucketOperations, BucketOptions, DeleteBucketOptions, MakeBucketOptions},
-    list::{StorageListObjectVersionsInfo, StorageListObjectsV2Info, StorageObjectInfoOrErr, StorageWalkOptions},
     multipart::{CompletePart, ListMultipartsInfo, ListPartsInfo, MultipartInfo, MultipartUploadResult, PartInfo},
     object::{DeletedObject, ObjectIO as _, ObjectOperations as _, ObjectToDelete},
     range::HTTPRangeSpec,
@@ -63,11 +62,6 @@ use tracing::warn;
 use tracing::{error, info};
 use uuid::Uuid;
 
-type ListObjectsV2Info = StorageListObjectsV2Info<ObjectInfo>;
-type ListObjectVersionsInfo = StorageListObjectVersionsInfo<ObjectInfo>;
-type ObjectInfoOrErr = StorageObjectInfoOrErr<ObjectInfo, Error>;
-type WalkOptions = StorageWalkOptions<fn(&FileInfo) -> bool>;
-
 const LIST_MULTIPART_SETS_CONCURRENCY: usize = 4;
 
 fn is_idempotent_delete_prefix_error(err: &Error) -> bool {