Rancher provisioned/managed RKE2/K3s data-dir support

[aalves08]

Summary

Fixes #11061

Occurred changes and/or fixed issues

• add k8sDistro dir to harvester cloud config path
• add unit test

Technical notes summary

Areas or cases that should be tested

• I just tested RKE2 cluster provisioning in general and it's working, afaik. Don't know how to test this further

Areas which could experience regressions

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[aalves08]

FYI @torchiaf . This "touches" Harvester