Fix autopilot test authentication errors (#16472) (#17116)

* Fix autopilot test authentication by removing WithoutNamespace option

* Revert: Keep WithoutNamespace() - token lacks namespace creation permission

* Fix autopilot test authentication after upgrade

- Use upgraded cluster's root token instead of original cluster token
- Fix API address references to point to upgraded cluster
- Add token validation logging to diagnose auth failures

The autopilot upgrade creates new nodes but reuses the same root token.
However, verification steps were incorrectly using the old cluster's
API addresses and inconsistent token references, causing 403 errors.

* Fix null interpolation in VAULT_ADDR_DEBUG

* formatting

* Fix autopilot verification to use upgraded cluster nodes

The verify_autopilot steps were trying to connect to the original cluster
nodes which are shut down by the remove_old_nodes step. Changed to use
the upgraded cluster's hosts and addresses instead.

Co-authored-by: hashigator <280075563+hashigator@users.noreply.github.com>