Multiple file upload with the Dropzone component

[ubuntolog]

There is a problem with the file queue processing in the Dropzone component. By default it uploads multiple files in chunks consisting of two files (the size can be changed, but the problem will still exist). If your Dockerfile is not in the first chunk, the backend immediately throws an exception by saying that Dockerfile is missing (which is not true, since it will be coming in one of the next chunks). The problem was detected while trying to upload 29 files. Current solution is to set "parallelUploads" attribute in Files.jsx to be 999.