Display code review summary when there are no comments

Vitali Tatarintevrequested to merge
ck3g-display_summary_provided_by_dcr into master

What does this MR do and why?

Display code review summary when there are no comments

When there are no comments from Duo Code Review, display summary information instead of hard-coded message in AI Gateway prompt.

Porting these changes !191415 (merged) to AI Gateway prompt

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