Support more assign cases in PropertyFetchAssignManipulator

[andersonamuller]

It was suggesting this rector rule in this case:

final class SomeClass
{
    private string $name;

    public function __construct()
    {
        $this->name = __NAMESPACE__;
        $this->name .= __CLASS__;
    }
}

[TomasVotruba]

Thanks 👍

Could you add test case as well so we avoid regressions?

[andersonamuller]

I added a test.

[TomasVotruba]

Thank you 🙏