[8.x] Use getRealPath to ensure console command class names are generated correctly

[sailingdeveloper]

protected function commands()
{
    $this->load(__DIR__.'/../Commands');

    require base_path('routes/console.php');
}

When trying to register a new path in the Kernel class of your application to load console commands, and the path contains .., the classname isn't generated correctly in https://github.com/laravel/framework/blob/8.x/src/Illuminate/Foundation/Console/Kernel.php#L223-L227

By using getRealPath, the real path is resolved and the classname can be generated correctly.

[sailingdeveloper]

I wasn't able to find existing tests for this logic to amend, if anyone can point me there, that'd be great :)