Fix hanging IORedis connections; add extollo.wontstop debugging helper

src/support/bus/RedisBus.ts

@@ -121,7 +121,8 @@ export class RedisBus implements EventBus {
     }
 
     down(): Awaitable<void> {
-        this.subscriberConnection?.disconnect()
-        this.publisherConnection?.disconnect()
+        // The Redis service will clean up the connections when the framework exits,
+        // so we don't need to do anything here.
+        return undefined
     }
 }