[export form] decouple data from PickCenter form

src/Bundle/ChillMainBundle/Export/ExportFormHelper.php

@@ -0,0 +1,37 @@
+<?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\Export;
+
+use Chill\MainBundle\Security\Authorization\AuthorizationHelperForCurrentUserInterface;
+
+final readonly class ExportFormHelper
+{
+    public function __construct(
+        private ExportManager $exportManager,
+        private AuthorizationHelperForCurrentUserInterface $authorizationHelper,
+    ) {
+    }
+
+    /**
+     * @param list<"centers"> $steps
+     */
+    public function getDefaultData(string $step, ExportInterface $export): array
+    {
+        $data = [];
+
+        if ($step === 'centers') {
+            $data['centers'] = $this->authorizationHelper->getReachableCenters($export->requiredRole());
+        }
+
+        return $data;
+    }
+}