feat: remove unused assignment status, rename 'open' to 'published'

src/Security/Voter/AssignmentVoter.php

@@ -47,8 +47,8 @@ class AssignmentVoter extends Voter
             return $this->security->isGranted('ROLE_ADMINISTRATIVE');
         }
 
-        // Only allow applications to open assignments
-        if (Assignment::STATUS_CLOSED === $assignment->getStatus()) {
+        // Only allow applications to published assignments
+        if (Assignment::STATUS_DRAFT === $assignment->getStatus()) {
             return false;
         }