E2E test: update duo chat spec to use duo chat button
What does this MR do and why?
Resolves https://gitlab.com/gitlab-org/gitlab/-/issues/470605 & https://gitlab.com/gitlab-org/gitlab/-/issues/470590
Since DuoChat is removed from help, we will open Duo Chat from the Duo Chat button instead.
How to set up and validate locally
GITLAB_QA_ADMIN_ACCESS_TOKEN=x QA_LOG_LEVEL=DEBUG QA_GITLAB_URL=https://gdk.test:3443 bundle exec rspec qa/specs/features/ee/browser_ui/16_ai_powered/duo_chat/duo_chat_spec.rb
(response may fail as gdk may not be configured to an ai gateway, but duo chat should open)
Edited by Jay McCure