Add help text to project release admin page to warn about marking branches unsupported and the impact on update status

Now is a good time to do this since 📌 Remove “recommended” status for releases? Active did get deployed.

Adding a draft to the issue summary for review and updating.

It looks like https://www.drupal.org/docs/develop/managing-a-drupalorg-theme-module-or... → might be a good page to link to for a detailed explanation, although that page could use an update for Drupal core’s current release schedule.

Cleaning up the draft in the issue summary

drumm → credited ressa → .

drumm → credited star-szr → .

I’ll go ahead and deploy what I have so far in the issue summary, followups can always change the text later. In particular, https://www.drupal.org/docs/develop/managing-a-drupalorg-theme-module-or... → could be linked to when it has some updates to be more comprehensive and align with core’s current release cycles.

Crediting people who helped in 📌 False warnings about security updates Active

This is now deployed