Refactor export handling to support ExportGeneration and SavedExport

Unified handling of ExportGeneration and SavedExport entities by introducing the SavedExportOrExportGenerationRepository. Simplified form data conversion using ExportConfigNormalizer, removing redundant FormBuilder logic. Adjusted dependent methods and controllers to accommodate these changes.

src/Bundle/ChillMainBundle/Repository/SavedExportOrExportGenerationRepository.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Repository;
+
+use Chill\MainBundle\Entity\ExportGeneration;
+use Chill\MainBundle\Entity\SavedExport;
+
+readonly class SavedExportOrExportGenerationRepository
+{
+    public function __construct(
+        private SavedExportRepositoryInterface $savedExportRepository,
+        private ExportGenerationRepository $exportGenerationRepository,
+    ) {}
+
+    public function findById(string $uuid): SavedExport|ExportGeneration|null
+    {
+        if (null !== $savedExport = $this->savedExportRepository->find($uuid)) {
+            return $savedExport;
+        }
+
+        return $this->exportGenerationRepository->find($uuid);
+    }
+}