[new-api] upload folder cleaning

How to read from stream?
```
data.file[0].stream
.on("data", function(chunk) {
console.log("chunk", chunk);
})
.on("end", function() {
console.log("end");
});
```
does not work without call `open()` and REMOVING this code
```
file.stream.on('open', function () {
fs.unlink(file.path, function () {})
})
```

Start by reproducing the upload using the shown data.file[0].stream data and end handlers, then compare it with the file.stream open handler and fs.unlink cleanup. No source files or tests are named; done means establishing the expected stream and cleanup behavior and documenting or correcting the failure.

Written by the indexing model from the issue text.