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.

templates/backoffice/quiz.html.twig

@@ -109,7 +109,7 @@
                         </form>
                     </td>
                     <td>{{ candidate.score|default('x') }}</td>
-                    <td>{{ candidate.time }}</td>
+                    <td>{{ candidate.time.format('%i:%S') }}</td>
                 </tr>
             {% else %}
                 <tr>