fix: isEncrypted breaks all volume page (under testing)

[a110605]

Summary

fix: isEncrypted() breaks the volume page.

Note. I don't have Kasten env to reproduce this bug..

PR Checklist

• Is this a multi-tenancy feature/bug?
  • Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • Yes, the backend owner is: @Vicente-Cheng

Related Issue #
harvester/harvester#7150

Occurred changes and/or fixed issues

Technical notes summary

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

[torchiaf]

Did you check if there are places where missing this.relatedPV breaks the UI ? Otherwise LGTM