Issue 329 - Improve checks against deletion of high-level directories in CBS cleanup

[lauren-li]

Add the following checks against pipeline deletion of high-level directories in Common Back-end Scripts deleteWorkspace.sh:

• -P option
• working directory path length check

Resolves #329

[M-DLB]

I though we also wanted to check that the working dir is a subfolder of the location pointed by $PIPELINE_WORKSPACE.
Would it be possible to implement this check as well? Thank you!

[lauren-li]

@M-DLB After discussing with @dennis-behm, we were thinking to handle the check that the CBS workspace is a child folder of the buildRootDirectory by dropping support for specifying absolute paths via the --workspace option, which Dennis says was primarily used for testing purposes earlier.

Because the removal of the capability to specify absolute paths via the --workspace option would involve changes beyond the Cleanup step to other functions in the pipeline (e.g. wdDeployPackageDir, getLogDir, and getApplicationDir, in addition to getWorkDirectory), we felt it it should be addressed all together via its own issue (#336) and PR, while keeping this PR (#330) scoped to adding checks for the Cleanup step. Would you agree with this approach?

[M-DLB]

Dropping the support for absolute paths will make our CI/CD pipeline templates for GitLab fail. Maybe other pipelines will be impacted too. This has to be thought carefully!

[dennis-behm]

Thanks for the updates to safeguard the deletions of the build workspace