Refactor private channels

[aocneanu]

Let's refactor our private channels from

'channels' => [
    'privateChannel' => $this->privateChannel(),
    'ioChannel' => $this->ioChannel(),
    'appUpdates' => 'app-updates',
    'taskChannel' => 'tasks.'.Auth::user()->id,
],

to:

'channels' => [
    'private' => $this->privateChannel(),
    'io' => $this->ioChannel(),   // operations => io
    'app-updates' => 'app-updates',
    'tasks' => 'tasks.'.Auth::user()->id,
],

from websockets.js we should import the channels prop and use channels.private, channels.io etc.