chore(k8s): add opensandbox release chart(all-in-one) & update controller release name

[Spground]

Summary

• What is changing and why?

1. Add opensandbox helm release to install all components (all-in-one)
2. Update controller component helm release name from opensandbox to opensandbox-controller

Testing

• Not run (explain why)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

If you have an existing opensandbox release, uninstall first, then reinstall with the new name: helm uninstall opensandbox -n opensandbox-system && helm
install opensandbox-controller

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[Pangjiping]

lgtm

[Spground]

see also #242