Create namespace when adding new SSH keys to Virtual Machines (backport #995)

[mergify]

Summary

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#5425

Occurred changes and/or fixed issues

Technical notes summary

It adds namespace creation in VirtualMachineSSHKey component, for both pages:

• Create Virtual Machines
• Create Virtual Machines templates

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

---

This is an automatic backport of pull request #995 done by [Mergify](https://mergify.com).