Unsubscribes and removes Realtime channel from Realtime client.
Removing a channel is a great way to maintain the performance of your project's Realtime service as well as your database if you're listening to Postgres changes. Supabase will automatically handle cleanup 30 seconds after a client is disconnected, but unused channels may cause degradation as more clients are simultaneously subscribed.
Examples
Remove a channel
final status = await supabase.removeChannel(channel);