Adds support disabling duo agent platform at namespace

Eduardo Bonetrequested to merge
eb-dap-enabled-namespace into master

What does this MR do and why?

Adds support disabling duo agent platform at namespace

Allows top level namespace admins to disable duo agentic features (catalog, chat, flows) without disabling classic duo features.

Changelog: added EE: true

How to set up and validate locally

  1. Setup duo test

  2. Update the setting using a query:

curl 'http://gdk.test:8080/api/v4/groups/1000000' \
    -X 'PUT' \
    -H "Authorization: Bearer $GITLAB_TOKEN" \
    -H 'Content-Type: application/json' \
    --data-raw '{ "ai_settings_attributes": { "duo_agent_platform_enabled": false } }'
  1. Check the value in gdk rails c 
Group.find_by_id(1000000).duo_agent_platform_enabled

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