Clean up cs_connect_with_sales feature flag and productize feature
What does this MR do and why?
Resolves https://gitlab.com/gitlab-org/gitlab/-/issues/454125
Cleans up cs_connect_with_sales
feature flag and productizes the feature.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
No visible change
How to set up and validate locally
- Setup to simulate SaaS and restart GDK
- Create a group with Ultimate Plan
- Navigate to
/groups/<my-group>/-/billings
- Confirm GitLab Duo Pro add-on card is still present
Related to #454125