[5.0] Illuminate\Foundation\Artisan is no longer needed in after the HTTP Kernel refactors.

Signed-off-by: crynobone <crynobone@gmail.com>
Latest commit show that @taylorotwell explicitly load deferred providers from within `Illuminate\Foundation\Console\Kernel`, so I'm not sure if this still relevant (only useful if Laravel still want to support calling "artisan" from non-console environment).