Refactor entities and codebase for native property usage

- Replaced getters/setters with direct property access across entities and repositories.
- Added and configured `martin-georgiev/postgresql-for-doctrine` for PostgreSQL enhancements.
- Updated Doctrine configuration with types, mappings, and JSONB query functions.
- Removed unused `EliminationService` and related YAML configurations.

src/Repository/QuizCandidateRepository.php

@@ -41,7 +41,7 @@ class QuizCandidateRepository extends ServiceEntityRepository
             throw new \InvalidArgumentException('Quiz candidate not found');
         }
 
-        $quizCandidate->setCorrections($corrections);
+        $quizCandidate->corrections = $corrections;
         $this->getEntityManager()->flush();
     }
 }