[D7EOL] - Do not allow Drupal 7 branches of projects to be re-supported after Aug 1st

Ready for review.

MR: https://git.drupalcode.org/project/drupalorg/-/merge_requests/176/diffs

We are displaying a message only if "7.x-" branches are found to let maintainers know that if they unsupport a 7.x branch they won't be able to mark it as supported again, or to let them know why they can't mark it as supported (ie: the security team marks the branch as unsupported).

Testing:
* https://fjgarlin-drupal.dev.devdrupal.org/node/2929000/edit/releases
* https://fjgarlin-drupal.dev.devdrupal.org/node/38878/edit/releases
* https://fjgarlin-drupal.dev.devdrupal.org/node/343333/edit/releases
* https://fjgarlin-drupal.dev.devdrupal.org/node/3114688/edit/releases (only D8+ branches, no message)
* https://fjgarlin-drupal.dev.devdrupal.org/node/7404/edit/releases (several 7.x branches)

Note that users with "administer all releases" can bypass this and won't see the message nor the disabling logic.

Image (above admin, below maintainer):

Deployed!

Automatically closed - issue fixed for 2 weeks with no activity.

Hello,

I have a same issue in https://www.drupal.org/project/wowjs →

How can i fix that?

Hello @drumm @fjgarlin @hestenet

I am facing this issue on my module - https://www.drupal.org/project/betterlogin → , It happened because 7.x-1.x branch set to unsupported accidentally & there's no option to set this supported

Is there any other way to make the module supported again.