Change project size update

[i-oden]

At first - project size updated after each uploaded file. This produced deadlock issues when uploading a lot of small files since it tried to update the same project table field at the same time in multiple requests.

Now - Updates the project size at the end of the upload. This means that if an error occurs during the upload, the project size is not updated.

Fix: Either add a queue (for example) to the API and update the db after each file, or add the project size update to the cleanup after failed upload.

[i-oden]

Size no longer a column in the Project table.