Migrating code reviews on pull requests

[lunny]

Currently when migrating a repository from github, you can migrate pull requests but reviews cannot be migrated.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. I am here to help clear issues left open even if solved or waiting for more insight. This issue will be closed if no further activity occurs during the next 2 weeks. If the issue is still valid just add a comment to keep it alive. Thank you for your contributions.

[lafriks]

Fixed in #9463