Implement roll-back of move operation in case the upload to a new location on the server has failed

[allexzander]

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Feature description

When we move some files/placeholders within the structure of the local sync folder, we might end up not being able to upload them to a new location on the server. The most recent case that I've encountered was with a user trying to move many files/folders from someone else's folder to the user's home folder. Since the user did not have enough space in the home folder on the server and received a lot of 507 errors, files were not uploaded to a new location on the server but stayed in a new location in the user's local folder.

We need to implement the roll-back mechanism so the file would get moved to its original location locally if the move has failed. The desktop client needs additional logic for this.