Infinite Polling for file status

It was implemented the polling of files statuses on nuxeo-aspera-upload-page in order to display updates to the user without forcing him to press the "refresh" button/option.

However the condition to stop the polling seems to be checking if the files are all completed, which may not be the case when a file fails. This leads to an infinite polling, even when we are not displaying the page.

Steps to Reproduce

1. Create a new Upload;
2. Select one file to be uploaded (size matters here: one big file will give you more time to perform the next step);
3. On Aspera desktop app, cancel the upload;
4. Check on your network panel that we are still calling the status endpoint;