Copilot code review: Comment experience improvements

Short summary

GitHub Copilot's code review feature now includes improved comment formatting with grouped suggestions and severity levels, making developer feedback easier to scan and act on without overwhelming reviewers. These enhancements streamline the collaborative review process for teams using GitHub's new pull requests experience. The update reflects GitHub's ongoing focus on enhancing developer productivity through AI-assisted code review.

• •Copilot code review comments now grouped by severity
• •Updated formatting improves scannability and reduces cognitive load
• •Rolling out to users on new pull requests experience

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