EnableValidationAttributesRector

Enable "framework.validation.enable_attributes" config, to load validation rules from attributes

 $container->loadFromExtension('framework', [
     'validation' => [
-        'enable_attributes' => false,
+        'enable_attributes' => true,
     ],
 ]);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Symfony\Configs\Rector\MethodCall\EnableValidationAttributesRector;

return RectorConfig::configure()
    ->withRules([
        EnableValidationAttributesRector::class,
    ]);
SETS:  Configs