Show the review summary note in the review email

What does this merge request do and why?

Behind the improved_review_email flag, DraftNotes::PublishService creates the summary note as part of the review, so it no longer sends its own email and shows first in the review email.

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

merge request acceptance checklist

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