fix: vGPU number not correct (backport #1253)

[mergify]

Summary

Consume domain?.devices?.gpus when VM is off, while consume harvesterhci.io/deviceAllocationDetails when VM is running

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: @Yu-Jack

Related Issue #
harvester/harvester#7003

Screenshot/Video

---

This is an automatic backport of pull request #1253 done by [Mergify](https://mergify.com).