replace_node.yml: Cleanup job aliases for 'nodetool drain' and 'stop scylla service' async tasks

[igorribeiroduarte]

As explained in the documentation of the async module { https://github.com/scylladb/scylla-ansible-roles/tree/master/example-playbooks/async_extra#failures }, if an async job finishes with a bad result the task will not cleanup the job alias. So we need a separate task for doing that.