Remove `hostPID: true` from the nodeplugin pod spec

I have a critical warning in my local playground cluster that reads like the following:

Sharing the host PID namespace lets the container see and signal all host processes, enabling process injection attacks.

K8s: Pod Security Standards
NSA/CISA Kubernetes Hardening Guide

DAEMONSET
rook-ceph / rook-ceph.rbd.csi.ceph.com-nodeplugin

Rook-Ceph version (Operator and Cluster): 1.19.7

For reference: I first opened it up here: https://github.com/rook/rook/issues/18032#issuecomment-5089145863

Start by locating the nodeplugin pod spec and its DaemonSet configuration, then inspect where hostPID is set. Confirm that removing it does not disrupt nodeplugin operation; done means the nodeplugin pod spec no longer enables the host PID namespace.

Written by the indexing model from the issue text.