Fixes for feature "Regroupment of center"

* allow more than 15 character in regroupment name
* remove unused methods in PickCenterType
* show only active Regroupment in form
* remove dead code and commented code

src/Bundle/ChillMainBundle/migrations/Version20230301155213.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Main;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20230301155213 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Alter type to TEXT for regroupment.name';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE regroupment ALTER name TYPE TEXT');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE regroupment ALTER name TYPE VARCHAR(15)');
+    }
+}