[13.x] Fix scopedBy attribute not following inheritance chain

[Muffinman]

This PR updates the global ScopedBy attribute to match the behaviour of global scopes added via the booted static method.

Example

Global Scope with trait attribute (does not work):

class PublishedScope implements Scope
{
    public function apply(Builder $builder, Model $model)
    {
      $builder->where('published', '=', 1);
    }
}

#[ScopedBy([PublishedScope::class])]
trait IsPost {

}

// Will not apply the global scope
class Post extends Model {
   use IsPost;
}

Global scope with static booted method (works):

class PublishedScope implements Scope
{
    public function apply(Builder $builder, Model $model)
    {
      $builder->where('published', '=', 1);
    }
}

trait IsPost {
    protected static function booted(): void
    {
        static::addGlobalScope(new PublishedScope);
    }
}

// Applies global scope
class Post extends Model {
   use IsPost;
}

After this PR both should work and be handled identically.

Targeting 13.x because I think this may be considered a breaking change. I will also leave in draft while I add a test.

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