Listens for any new channel disconnections:
Example
const listener = (channelPayload) => console.log(channelPayload); // see return value below
fin.InterApplicationBus.Channel.onChannelDisconnect(listener);
// example shape
{
"topic": "channel",
"type": "disconnected",
"uuid": "OpenfinPOC",
"name": "OpenfinPOC",
"channelName": "counter",
"channelId": "OpenfinPOC/OpenfinPOC/counter"
}