Add additional metrics to the AI impact analytics dashboard

What does this MR do and why?

Adds additional metrics to the AI impact analytics dashboard

Adds new metrics:

• Merge request throughput
• Code contributors
• Median time to merge

Hides old metrics:

• Cycle time
• Change failure rate

Note: I chose to keep the old metrics hidden instead of removing them outright, since we plan to move VSD to use the same visualization here (#541330 (closed)). This MR will help progress that effort

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Ensure that you are using GitLab Ultimate
2. Configure your GDK to use ClickHouse
3. Enable this patch to apply the Duo AddOn

diff --git a/ee/app/models/ee/user.rb b/ee/app/models/ee/user.rb
index 5e38e942fe7b..4864d0a6e531 100644
--- a/ee/app/models/ee/user.rb
+++ b/ee/app/models/ee/user.rb
@@ -543,7 +543,7 @@ def assigned_to_duo_enterprise?(container)
         .for_duo_enterprise
         .active
         .by_namespace(namespace)
-        .assigned_to_user(self).exists?
+        .assigned_to_user(self).exists? || true
     end
 
     def assigned_to_duo_pro?(container)

4. Navigate to the Analytics dashboard page for any group (ex. http://gdk.test:3000/groups/flightjs/-/analytics/dashboards)
5. Select the AI impact analytics dashboard

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #550351