[Improvement] kubeblocks upgrade should check if the target version exits first

[ldming]

Is your improvement request related to a problem? Please describe.

kubeblocks upgrade should check if the target version exits first, otherwise, the kubeblocks will be stopped, but the new version can not be installed.

kbcli kb upgrade --version 0.7.1 
Current KubeBlocks version 0.7.0.
Upgrade KubeBlocks from 0.7.0 to 0.7.1
Please type 'Yes/yes' to confirm your operation: yes
Add and update repo kubeblocks                     OK
Stop KubeBlocks 0.7.0                              OK
Stop DataProtection                                OK
Upgrading KubeBlocks to 0.7.1                      FAIL
error: chart "kubeblocks" matching 0.7.1 not found in kubeblocks index. (try 'helm repo update'): no chart version found for kubeblocks-0.7.1