[8.x] Automatically add event description when scheduling a command

[maartenpaauw]

Description

This code will use the command description as event description. This could be useful when listing all scheduled commands.

Before

$schedule->command(Command::class)
    ->description((new Command())->getDescription())
    ->daily();

After

$schedule->command(Command::class)
    ->daily();

The code above will output the same result when running php artisan schedule:list.

[taylorotwell]

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