[Php81] Merge attributes on NewInInitializerRector (#3546)

* Add failing test fixture for NewInInitializerRector

# Failing Test for NewInInitializerRector

Based on https://getrector.com/demo/dd5bff80-0789-4aae-b2a3-686c23a3d164

* Update property_with_attributes.php.inc

* Closes #3516

---------

Co-authored-by: Leo Viezens <leo.viezens@web.de>

rules-tests/Php81/Rector/ClassMethod/NewInInitializerRector/Fixture/property_with_attributes.php.inc

@@ -0,0 +1,41 @@
+<?php
+
+namespace Rector\Tests\Php81\Rector\ClassMethod\NewInInitializerRector\Fixture;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Ulid;
+
+#[ORM\Entity]
+class Carrier
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'ulid', unique: true)]
+    private Ulid $id;
+
+    public function __construct(
+        ?Ulid $id = null,
+    ) {
+        $this->id = $id ?? new Ulid();
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Php81\Rector\ClassMethod\NewInInitializerRector\Fixture;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Ulid;
+
+#[ORM\Entity]
+class Carrier
+{
+    public function __construct(#[ORM\Id]
+    #[ORM\Column(type: 'ulid', unique: true)]
+    private Ulid $id = new Ulid())
+    {
+    }
+}
+
+?>

rules/Php81/Rector/ClassMethod/NewInInitializerRector.php

@@ -161,6 +161,7 @@ private function processPropertyPromotion(ClassMethod $classMethod, Param $param
         }
 
         $param->flags = $property->flags;
+        $param->attrGroups = array_merge($property->attrGroups, $param->attrGroups);
         $this->removeNode($property);
     }