Restrict volume mountpoint to /var/lib/kubelet/pods

[srranjan-sri]

What type of PR is this?

What this PR does / why we need it:
Restrict Azure File CSI driver mountpoint-dir to /var/lib/kubelet/pods

This change restricts the mountpoint-dir volume mount to /var/lib/kubelet/pods instead of the entire /var/lib/kubelet/ directory. This reduces the driver's access scope, improving security by limiting the host filesystem paths that the CSI driver can access.

Which issue(s) this PR fixes:

Fixes #
Updated mountpoint-dir hostPath and mountPath from /var/lib/kubelet/ to /var/lib/kubelet/pods
Uses single kubelet variable with /pods suffix appended directly in templates

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: srranjan-ms / name: Srirajiv Ranjan (1dd14fa, e85d52b)

[k8s-ci-robot]

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[andyzhangx]

this csi driver mount different folders under /var/lib/kubelet/, e.g. plugins, kerberos, kubernetes/csi, and azfilesauth may create different folders under this dir, if we restrict all dirs in this csi driver, that would make this csi driver difficult to functional well and difficult to maintain