Fix propagation of error when creating the VM. This prevents the runtime from detecting a protocol version violation, thus not showing the nice error message.

Author: slinkydeveloper

packages/restate-sdk/src/endpoint/handlers/generic.ts

@@ -120,7 +120,7 @@ export class GenericHandler implements RestateHandler {
       this.endpoint.rlog.error(
         "Error while handling invocation: " + (error.stack ?? error.message)
       );
-      return this.toErrorResponse(500, error.message);
+      return this.toErrorResponse((error instanceof RestateError) ? error.code : 500, error.message);
     }
   }