Correctly catch and notify user about NodeShell pod failures (#4244)

* Correctly catch and notify user about NodeShell pod failures

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix error throwing sometimes during Terminal.detach

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/api/websocket-api.ts

@@ -37,11 +37,11 @@ interface IMessage {
 }
 
 export enum WebSocketApiState {
-  PENDING = -1,
-  OPEN,
-  CONNECTING,
-  RECONNECTING,
-  CLOSED,
+  PENDING = "pending",
+  OPEN = "open",
+  CONNECTING = "connecting",
+  RECONNECTING = "reconnecting",
+  CLOSED = "closed",
 }
 
 export class WebSocketApi {