fix: resolve post-merge compilation failure after KvApi refactoring

The merge of PR #18751 and #18759 introduced a semantic conflict where
vacuum tests were still importing the old KVApi trait instead of the
new KvApiExt trait. This caused compilation failures despite no git
merge conflicts being detected.

Author: dantengsky

src/query/ee/tests/it/storages/fuse/operations/vacuum.rs

@@ -32,7 +32,7 @@ use databend_common_meta_app::schema::DatabaseId;
 use databend_common_meta_app::schema::TableInfo;
 use databend_common_meta_app::schema::TableMeta;
 use databend_common_meta_app::storage::StorageParams;
-use databend_common_meta_kvapi::kvapi::KVApi;
+use databend_common_meta_kvapi::kvapi::KvApiExt;
 use databend_common_meta_store::MetaStore;
 use databend_common_meta_store::MetaStoreProvider;
 use databend_common_meta_types::TxnRequest;