fix(ecstore): capture complete fsync worker guard

(cherry picked from commit 1dc90bb836e20ea9ee45d0a629a9201e20d231c4)

crates/ecstore/src/disk/local.rs

@@ -13459,6 +13459,7 @@ mod test {
             let fence = disk
                 .snapshot_leases
                 .lock()
+                .await
                 .entries
                 .get(&SnapshotLeaseKey {
                     volume: RUSTFS_META_BUCKET.to_string(),

crates/ecstore/src/disk/os.rs

@@ -826,12 +826,13 @@ impl Drop for DstDirFsyncWorkerGuard {
 
 fn run_dst_dir_fsync_group_worker(group: Arc<DstDirFsyncGroup>) -> impl std::future::Future<Output = ()> {
     // Capture before spawning: shutdown may drop the future without polling it.
-    let mut worker_guard = DstDirFsyncWorkerGuard {
+    let worker_guard = DstDirFsyncWorkerGuard {
         group: group.clone(),
         in_flight: 0,
         armed: true,
     };
     async move {
+        let mut worker_guard = worker_guard;
         loop {
             #[cfg(test)]
             fsync_dir_recorder::run_before_group_batch(&group.dir);