Add longhorn support message in VM clone dialog

[torchiaf]

Summary

• Re-enabling Longhorn V2 unsupported dialogs and Add a warning message in the dialog layouts; the actions continue to be disabled:
  • VM -> Clone, Snapshot (todo)
  • Volume -> Clone, Export, Snapshot

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:

Related Issue harvester/harvester#6989

Occurred changes and/or fixed issues

Technical notes summary

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

[torchiaf]

@tserong @Vicente-Cheng I also disabled the VM -> Migrate action, for those Vms that contain Longhorn v2 volumes. Is it correct ?