Add Duo agentic platform sidebar widget for Gitlab.com

Doug Stullrequested to merge
563874-saas-duo-widget into master

What does this MR do and why?

Add Duo agentic platform sidebar widget for Gitlab.com

Screenshots or screen recordings

Note The feature preview text and button is changing as part of Adjust duo agent platform widget feature previe... (!204262 - merged), so the below could get out of date for that.

Screen_Recording_2025-09-08_at_3.31.00_PM

How to set up and validate locally

Note Covered by ee/spec/features/gitlab_subscriptions/duo/agent_platform_widget_in_sidebar_spec.rb and unit specs

  1. Setup gdk to simulate SaaS - https://docs.gitlab.com/ee/development/ee_features.html#simulate-a-saas-instance and restart GDK
  2. set instance duo default availability in rails console: ::Gitlab::CurrentSettings.update!(duo_availability: 'default_on')
  3. In rails console, enable the feature flag. 
    ::Feature.enable(:duo_agent_platform_widget_gitlab_com)
  4. Create a top level group
  5. In the gitlab admin UI, edit the group to be on an ultimate subscription.
  6. Visit the group overview page for that group.

MR acceptance checklist

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Related to #563874

Edited by Doug Stull

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