[BUG]opengauss cm leftovers should be cleaned after kb uninstalled

[ahjing99]

➜ ~ kbcli version Kubernetes: v1.27.3-gke.100 kbcli: 0.8.0-beta.13

The following leftovers should be cleaned along with kb uninstall

➜  ~ kbcli kubeblocks install
KubeBlocks will be installed to namespace "kb-system"
error: there are resources left by previous KubeBlocks version, try to run "kbcli kubeblocks uninstall" to clean up
  configmaps: opengauss-agamotto-configuration,opengauss-configuration,opengauss-custom-metrics,opengauss-scripts
➜  ~ k get cm
NAME                               DATA   AGE
kube-root-ca.crt                   1      17h
opengauss-agamotto-configuration   1      16h
opengauss-configuration            2      16h
opengauss-custom-metrics           1      16h
opengauss-scripts                  1      16h