message: Remove attach & chunked ops types from container.ts
  Closes Remove attach & chunked ops types from container.ts
diff: @@ -1374,10 +1374,6 @@ export class Container extends EventEmitterWithErrorHandling<IContainerEvents> i
  case MessageType.Operation:
  case MessageType.RemoteHelp:
  case MessageType.Summarize:
  - // Back-compat: <= 0.21.0
  - // Legacy, to be removed in next version(s)
  - case "attach":
  - case "chunkedOp":
  break;
  default:
  this.close(CreateContainerError(`Runtime can't send arbitrary message type: ${type}`));
  