reduce all major allocations in replication path (#18032)

- remove targetClient for passing around via replicationObjectInfo{}
- remove cloing to object info unnecessarily
- remove objectInfo from replicationObjectInfo{} (only require necessary fields)

buildscripts/disable-root.sh

@@ -56,6 +56,8 @@ done
 
 set +e
 
+sleep 10
+
 ./mc ls minioadm/
 if [ $? -ne 0 ]; then
 	echo "listing failed, 'minioadmin' should be enabled"