[BUG] Update container args in ClusterDefinition does not take effect

[yimeisun]

Describe the bug
User creates cluster with container args '2d' in clusterdefinition first, and update the container args with '3d' , but the args does not take effect.

To Reproduce

1. cd kubeblocks
2. make manifests && make generate && make install
3. start kubeblocks with IDE
4. cd deploy/prometheus-cluster && helm dependency build
5. helm upgrade --install kb-addon-prometheus . --set="nameOverride=playground,prometheus.server.retention=2d"
6. helm upgrade --install kb-addon-prometheus . --set="nameOverride=playground,prometheus.server.retention=3d"

Expected behavior
After step 5), the args in created cluster prometheus is 2d,
After step 6), the args in created cluster prometheus is 3d.