Updates duo workflow user docs
What does this MR do and why?
This updates instruction on how to execute a Duo Workflow in a CI pipeline.
There are two ways to execute a Duo Workflow:
Right now, we have IDE execution of a workflow for the dogfooding MVP. This requires local Docker and Colima setup and the workflow is triggered using VS code extension. We are adding CI pipeline execution of workflow that avoids the local setup to reduce friction in usage. Underlying components for the duo workflow remain same in both ways, we are just providing an additional runtime option as a hosted CI pipeline to run untrusted customer workloads with stability, support, security, abuse prevention.
We've worked on the backend api part for this flow in #472975 (closed). FE work is yet to be picked up for this flow. (Hence the doc mentions cURL request)
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