[Go-server] Fix formatting of go-server generated code (#7162)

* Add missing go-server petstore batch script

* Make go-server confirm to gofmt

samples/server/petstore/go-api-server/go/logger.go

@@ -20,4 +20,4 @@ func Logger(inner http.Handler, name string) http.Handler {
             time.Since(start),
         )
     })
-}
+}