Closes #190

Documentation has been updated to reflect the new directory, and I have added a new environment variable to allow referencing to the source directory.

I can confirm that sym-links also work!! This worked when I tried it:

$ ls -lh
total 12K
drwxr-xr-x 7 hagertnl hagertnl 4.0K Dec 19 17:02 Run_Archive
drwxr-xr-x 2 hagertnl hagertnl 4.0K Dec 19 17:02 Scripts
lrwxrwxrwx 1 hagertnl hagertnl   31 Dec 19 17:01 Source -> ../test_test_source_dir/Source/
drwxr-xr-x 7 hagertnl hagertnl 4.0K Dec 19 17:02 Status

This makes it much easier to maintain differences if needed by more than 1 test.

I'm finding some sort of problem with the old-Python implementation of this:

cp: cannot overwrite directory '/lustre/orion/proj-shared/stf243/hagertnl/harness_sspace/borg/12.27.24-09.45/amdgpu_checkout/01_allocate_full_hbm_cray/1735310728.4993293/build_directory' with non-directory
Encountered an error copying a test's Source directory from /lustre/orion/stf243/proj-shared/hagertnl/Scratch/harness-dev/frontier/amdgpu_checkout/01_allocate_full_hbm_cray/Source to /lustre/orion/proj-shared/stf243/hagertnl/harness_sspace/borg/12.27.24-09.45/amdgpu_checkout/01_allocate_full_hbm_cray/1735310728.4993293/build_directory

If I load a newer Python version, then it works as expected. Working to reproduce now.

The sym-links that I previously reported as working appear to no longer be working 🤔 . It's possible that I only checked the sym-links for the newer Python version and that I didn't actually verify it for the shell implementation.

Okay, so the problem was that I had sym-links going to & from multiple test source directories. For example, maintain a Makefile in one test, then sym-link to it from all other tests of a certain type. We need that sym-link to be dereferenced in that case, so I have set the following behavior:

sym-links in <app>/Source are preserved when copied
sym-links in <app>/<test>/Source are dereferenced

The <app>/Source directory should be stand-alone (not referencing any other paths outside of Source), while it is feasible that a group of test's may want to share the same Makefile, job template or check script.

I've pushed these changes to the default behavior now, and confirmed that it is working for my newly-refactored amdgpu_checkout tests.