[Improvement] auto-complete for 'kbcli cluster delete-backup '

[shanshanying]

kbcli version 
KubeBlocks: 0.8.0-alpha.9
kbcli: 0.8.0-alpha.9

To reproduce:

1. install kbcli and kubeblocks

install kbcli

curl -fsSL https://kubeblocks.io/installer/install_cli.sh | bash

and install kubeblocks

kbcli kubeblocks install

if there is no accessible k8s, just use our playground

 kbcli playground init

ref to: https://kubeblocks.io/docs/preview/user_docs/try-out-on-playground/try-kubeblocks-on-your-laptop
2. create a mysql cluster

 kbcli cluster create mycluster --cluster-definition apecloud-mysql --cluster
-version ac-mysql-8.0.30

3. check cluster status, wait till it is running

 kbcli cluster list mycluster

4. create a backup

kbcli cluster backup mycluster --method xtrabackup

Because there is no BackupRepo configured, this backup task should fail as expected.

5. delete the backup by

If you type tab at this moment, there is no auto-completion for backup names.

For comprision, you can try

kbcli cluster list my<tab>

and cluster name mycluster will be completed.

[techwithbhavya]

Hey @shanshanying, I would like to work on this issue. It would be great if you can assign me this issue.

[github-actions]

This issue has been marked as stale because it has been open for 30 days with no activity