Code Suggestions GA alert for non owners

What does this MR do and why?

Resolves https://gitlab.com/gitlab-org/gitlab/-/issues/434088.

Code Suggestions GA alert for non owners to display on every page of group and projects if the parent group is on a paid plan.

Screenshots or screen recordings

How to set up and validate locally

Setup feature flags

Feature.enable(:code_suggestions_ga_non_owner_alert)
Feature.enable(:ai_assist_ui)
Feature.enable(:ai_assist_flag)

1. Setup GDK to simulate SaaS.
2. Login as Admin and set a public group use EE plan that is not trial with instructions point 3 here
3. On the group's admin page: http://gdk.test:3000/admin/groups/<group_name>, pick a non-owner group member to impersonate and view the group and projects in it to interact and observe the alert.

To clear user callout to show alert again, run ::Users::Callout.last.destroy

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #434088