Output an error when using an attribute on an abstract class

### Feature request

For some reason they do not work on abstractions: https://phpstan.org/r/d0c0fff1-7aea-4b67-afd0-6958a3ef94b2

So should phpstan warn about this ?

When used on the non abstract class it works: https://phpstan.org/r/b7397f68-d652-448c-874a-d7e4ef2ec951

### Did PHPStan help you today? Did it make you happy in any way?

Yay, every day !!!