GNU Parallel

[wkaisertexas]

During testing for deliverable 4, I have been using gnu parallel to get the tests to run faster.

This change is a fairly crude revised script that chatgpt was able to make.

I was wondering if refactoring to gnu parallel (even though it is not installed by default on all systems) could be good at speeding up test-time execution.

For context, tests took 1 minute and 47 seconds without gnu parallel

real    1m47.427s
user    1m6.890s
sys     0m13.096s

However, tests only took 30 seconds with gnu parallel

2/195 tests failed

real    0m29.770s
user    1m14.099s
sys     0m10.804s

If this is a change that you would consider accepting, I would be happy to properly rewrite this script to allow for parallel execution.