docs: Add setup instructions for testing Agentic Duo Chat in Web UI

Summary

This MR adds comprehensive setup instructions for testing GitLab Duo Agentic Chat in the Web UI within the GitLab Development Kit (GDK).

What does this MR do?

Adds a new section "Testing Agentic Duo Chat in Web UI" to the Duo Workflow development documentation with step-by-step instructions for:

  • Configuring Workhorse to disable origin checks for development
  • Recompiling Workhorse with the necessary changes
  • Setting up Duo Workflow Service configuration
  • Running the Duo Workflow Service server

Why was this change made?

Previously, there were no documented instructions for setting up Agentic Duo Chat in the Web UI locally. This documentation fills that gap and provides developers with clear, actionable steps to test this feature in their GDK environment.

Edited by Jeff Park

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