Deleting folders from job output can cause trouble with hosttools

[ant0nsc]

HD_c76edbb2-7d26-445b-9571-90c5c91cd010_0 in RadiomicsNN, experiment antonsc_recovery2, pl_1_5_crossval. This job fails with a service error in hosttools. Root cause is that we are deleting large sets of files after finishing the crossvalidation evaluation.
create_ensemble_model_and_run_inference has several calls to remove_file_or_directory.

Fix: write all those files to a temp folder, and upload from there.

AB#4783