Remove daemon/LabelSession

daemon/LabelSession is not used and additionally it creates a confusion with recently introduced file/LabelSession (#2 (closed)).

At one of the dev meetings we have already agreed, that daemon/LabelSession should be removed, we use an operation script for labelling: https://gitlab.cern.ch/cta/operations/-/blob/master/tape/ctaops-cern-tape-utils/tape-label