Description of problem:

the pre-existing instances docs never mentioned the k8s SA need to be created before running the configuration script.

the manually configuration does not menion that neither.

it is the SA created via helm install from ai-rhdh-installer: https://github.com/redhat-ai-dev/ai-rhdh-installer/blob/d76a33ed90df762915d1625c41b35bbafff3c877/chart/templates/k8s-serviceaccount.yaml#L5

but we cannot assume user have all the operators installed via the installer.

without the SA, the configure script gives me error

* Updating existing RHDH deploymentOK
* Adding Tekton information and plugin to backstage deployment data: The Deployment "backstage-developer-hub" is invalid: spec.template.spec.containers[0].env[1].valueFrom.secretKeyRef.name: Invalid value: "": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

Prerequisites (if any, like setup, operators/versions):

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