Update Vault instructions for cluster rebuild (!5207) · Merge requests · GitLab.com / Runbooks

We now force our clusters to build the secrets for us, this is now hard coded
Let's update our docs to account for this as the service account and secret are not linked, thus not queryable at the moment.
Work to improve this in the future is here: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16931

Update Vault instructions for cluster rebuild