Bring Self-Hosted Code Review Summary to Experimental on Duo Self Hosted

What does this MR do and why?

For #524932 (closed)

Bring "Summarize Review" feature to Experimental for GitLab Duo Self Hosted

Feature setting

Summary generated by the feature

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

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 #524932 (closed)