Common Backend ScriptsdeleteWorkspace.sh script

[dennis-behm]

This is adding a new script to the common backend scripts to allow pipelines to cleanup the workspace directory on Unix System Services.

For instance, when a feature branch pipeline is finished successfully, the files on Unix System Services are no longer needed and can be deleted.

[M-DLB]

@dennis-behm - As discussed orally, I think we should simplify the way repositories are cloned to USS, removing the branch name as part of the path. It would greatly simplify the management and the lifecycle of the branches, as repositories would be cloned under the temporary build folder, and this build folder would simply be removed at the end of the pipeline execution with the script you develop in this PR.
It means the processing would be much simpler as we wouldn't have to deal with this tree of potential empty folders, representing the different branches. Can you please update this script and the gitClone.sh to work that way?
Thank you!

[dennis-behm]

@M-DLB, please see commit 71657da for the script simplification. Let's treat the updated recommendation of the unique workspace id in a separate PR.

[M-DLB]

Agreed, thank you