Clean up:

[jacobweinstock]

Description

Remove references to sandbox. Update versions for helm, k3d, etc. Update template images to use latest as quay.io/tinkerbell/actions/ don't have tags.

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• [ ] updated the documentation and/or roadmap (if required)
• [ ] added unit or e2e tests
• [ ] provided instructions on how to upgrade