Issue #3259814: If a Cron update fails after it has started the stage should be destroyed

src/CronUpdater.php

@@ -122,15 +122,16 @@ class CronUpdater extends Updater {
       return;
     }
     catch (\Throwable $e) {
+      $this->logger->error($e->getMessage());
+      return;
+    }
+    finally {
       // Destroy the stage if it still remains, unless the error happened during
       // destroy() in which case it is not possible to destroy the stage.
       if (!$this->isAvailable() && !$is_applied) {
         $this->destroy();
       }
-      $this->logger->error($e->getMessage());
-      return;
     }
-
     $this->logger->info(
       'Drupal core has been updated from %previous_version to %update_version',
       [