Check for "core" key in info.yml files

Please review. Added the screenshot.

The check worked when I tested it on Simple XML Sitemap 8.x-3.11 🎉

Here's a text export of the upgrade status report, including the core key issue being flagged for simple_sitemap itself, and every one of its sub-modules:
https://www.drupal.org/files/issues/2023-06-08/single-export-simple_site... →

(I updated viewsreference earlier tonight, so I can't check that module anymore.)

Two thoughts about the deprecation message:

1. "Remove core key from info.yml file as it is not compatible..." -- could just say "Remove core key as it is not compatible..."
2. Should we include the core key value, as is done with core_version_requirement? -- sincere question, maybe no need because the fix is to remove the line anyway, just thinking out loud.

Thank you!

Hello Guys, U have installed upgrade status module 4.x-dev On my drupal 9.5, PHP version - 8.1, Composer 2.6.
I am getting the same 5 problems as you can see in my attached screenshot.
Thank You.

After implementing the code in MR! I am getting this screen. Please see in my attached screenshot

Gábor Hojtsy → made their first commit to this issue’s fork.

Slightly updated to check the specific requirement as per the docs. Since this version of the project is not compatible with Drupal 8, its not likely that modules would still have the supported combination, but if they do, they would get the "module not compatible with next major version" message first, and when that is resolved would get the core key message. Please review.