[2.12.0] Ensure compatibility with security demo configuration script changes

[derek-ho]

Is your feature request related to a problem?

With 2.12.0 release, the security plugin's install demo configuration script will require an initial admin password to be set in order to run. It is important that the migrations team/repo is aware and working with this change.

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[derek-ho]

opensearch-project/security#3624

[derek-ho]

#480 - draft PR, but need some assistance with understanding how/where this is used in the wild and in CI (which I would expect to pass until 2.12.0 docker image is released)