fix(restore): use backup bluster ID in remaining_bytes metric

There was a confusion about which cluster ID should
be used for labeling remaining_bytes metric.
When setting remaining_bytes, we used backup cluster ID,
but when decreasing, we used restore cluster ID.
Backup cluster ID should be used in both places
as this metrics describes how many bytes from
which place are yet to be restored. Since we use backup
cluster DC, node ID, etc., we should also use backup
cluster ID.

pkg/service/restore/tablesdir_worker.go

@@ -253,8 +253,8 @@ func (w *tablesWorker) onLasEnd(ctx context.Context, b batch, pr *RunProgress) {
 	w.metrics.IncreaseRestoreStreamDuration(w.run.ClusterID, pr.Host, timeSub(pr.RestoreStartedAt, pr.RestoreCompletedAt))
 
 	labels := metrics.RestoreBytesLabels{
-		ClusterID:   w.run.ClusterID.String(),
-		SnapshotTag: w.run.SnapshotTag,
+		ClusterID:   b.ClusterID.String(),
+		SnapshotTag: b.SnapshotTag,
 		Location:    b.Location.String(),
 		DC:          b.DC,
 		Node:        b.NodeID,