Handle the 'need-repro' label like the 'need-info' label:
* Add a comment that we need a repro, and how to get one.
* Close the issue if no comments within 7 days.
* Add a 'need-attention' label if reporter comments.
Also add a document explaining how to create a repro, modeled after (copied)
MAUI's document (https://github.com/dotnet/maui/blob/main/.github/repro.md).
Rolf Bjarne Kvinge