feat: filter assignments and applications by country

closes #8698fpqq5

src/Repository/AssignmentRepository.php

@@ -169,6 +169,13 @@ class AssignmentRepository extends ServiceEntityRepository
                 ;
             }
         }
+
+        if (null !== $country = $filterDto->getCountry()) {
+            $qb
+                ->andWhere($qb->expr()->eq('destination.country', ':country'))
+                ->setParameter('country', $country)
+            ;
+        }
     }
 
     public function getBookmarkQueryForTeamer(Teamer $teamer): Query