Removing /tmp/scratch files at end of array job

[nmerket]

Fixes #404.

Pull Request Description

At the request of the HPC team, we're cleaning up /tmp/scratch at the end of the job because their script is timing out and causing the nodes to fail and be pulled out of the pool.

Checklist

Not all may apply

• [x] Code changes (must work)
• [x] Tests exercising your feature/bug fix (check coverage report on Checks -> BuildStockBatch Tests -> Artifacts)
• [x] Coverage has increased or at least not decreased. Update minimum_coverage in .github/workflows/ci.yml as necessary.
• [x] All other unit and integration tests passing
• [x] Update validation for project config yaml file changes
• [x] Update existing documentation
• [x] Run a small batch run on Eagle to make sure it all works if you made changes that will affect Eagle
• [x] Add to the changelog_dev.rst file and propose migration text in the pull request

[github-actions[bot]]

File	Coverage
All files	86%	:white_check_mark:
base.py	90%	:white_check_mark:
eagle.py	77%	:white_check_mark:
exc.py	57%	:white_check_mark:
local.py	70%	:white_check_mark:
postprocessing.py	84%	:white_check_mark:
utils.py	96%	:white_check_mark:
sampler/base.py	79%	:white_check_mark:
sampler/downselect.py	33%	:white_check_mark:
sampler/precomputed.py	93%	:white_check_mark:
sampler/residential_quota.py	61%	:white_check_mark:
test/test_docker.py	33%	:white_check_mark:
test/test_validation.py	97%	:white_check_mark:
workflow_generator/base.py	90%	:white_check_mark:
workflow_generator/commercial.py	53%	:white_check_mark:
workflow_generator/residential_hpxml.py	86%	:white_check_mark:

Minimum allowed coverage is 33%

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