Updates pre-requisites setup doc for DUo Workflow
What does this MR do and why?
This updates Duo Workflow pre-requisites setup docs. It introduces a shell script that downloads the dependencies and prepares the environment to run Duo Workflow in container setup.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
How to set up and validate locally
Follow steps in doc/user/duo_workflow/index.md
for pre-requisites and run a test workflow in VS code
Related to #482001 (closed)