Check for `Upstream-Status` value

[tym2k1]

It would be beneficial to implement a rule that triggers a warning or error message if the Upstream-Status variable in a patch is set to specific values, such as Pending. The Pending value is often used during development to suppress errors when the Upstream-Status is not set, but it is not suitable for production environments. This rule would help prevent patches with inappropriate Upstream-Status values from being merged into production, reducing the maintainance burden in in the long run.

Upstream-Status documentation