refactor: narrow test harness compatibility surfaces (#3592)

fuzz/fuzz_targets/path_containment/storage_compat.rs

@@ -0,0 +1,23 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub(crate) mod ecstore {
+    pub(crate) mod bucket {
+        pub(crate) mod utils {
+            pub(crate) use rustfs_ecstore::bucket::utils::{
+                check_object_name_for_length_and_slash, has_bad_path_component, is_valid_object_prefix,
+            };
+        }
+    }
+}