[Improvement]scaleIn or offlineInstances can retain pvc

[lancelot1989]

We use local-pv for data storage. When we need to perform maintenance on a node, to ensure data persistence and recoverability, we offlineInstance to recycle the pods on the specified node and reclaim computing resources. However, we aim to retain the PVC so that in the event of a failure caused by the pod recycled, we can quickly onlineInstance and reuse the data from the PVC.