[Php74] Skip anonymous classes in RestoreDefaultNullToNullableTypePropertyRector

[TomasVotruba]

What

RestoreDefaultNullToNullableTypePropertyRector now bails early for anonymous classes:

public function refactor(Node $node): ?Node
{
    if ($node->isAnonymous()) {
        return null;
    }
    ...

Tests

Added skip_anonymous_class fixture (a new class { public ?string $name; } left unchanged). Full rule suite green (13 tests). ECS + PHPStan level 8 clean.