feat: refactor staffing status assignment and filtering

src/Controller/Teamer/Application/WithdrawController.php

@@ -37,6 +37,10 @@ class WithdrawController extends AbstractController
             $this->entityManager->remove($application);
             $this->entityManager->flush();
 
+            // Update staffing status of related assignment
+            $assignment->updateStaffingStatus();
+            $this->entityManager->flush();
+
             $this->logger->info('Withdraw application', [
                 'teamer_id' => $teamer->getId(),
                 'teamer_name' => (string) $teamer,