feat: filter assignments and applications by country

closes #8698fpqq5

src/Repository/ApplicationRepository.php

@@ -102,6 +102,13 @@ class ApplicationRepository extends ServiceEntityRepository
             }
         }
 
+        if (null !== $country = $filterDto->getCountry()) {
+            $qb
+                ->andWhere($qb->expr()->eq('destination.country', ':country'))
+                ->setParameter('country', $country)
+            ;
+        }
+
         return $qb->getQuery();
     }