feat: enhance JoinCluster functionality and improve etcd cluster management and implement CreateDockerRunScriptWithAddMember func
- Update JoinCluster function with last_etcd_rebuilder functions
- Replaced CreateDockerRunScript with UpdateDockerRunScript in last_etcd_rebuilder
- All nodes are running, but they are operating separately. The next step is to perform a member add operation to join them into a cluster.
- implement CreateDockerRunScriptWithAddMember func