Fixes temp directory and bigmem issues with kestrel runs

[ChristopherCaradonna]

Fixes # .

Pull Request Description

This fixes Kestrel run errors related the existing files in the common temp directory on local node storage. Eagle assumes there is always local storage, and sets the TMPDIR to /tmp/scratch/$USER. Kestrel always assumes there is no local disk, and sets TMPDIR to /tmp/scratch. Existing files from other users on /tmp/scratch cause buildstock batch to fail.

This fix ensures the temporary directory is set to /tmp/scratch/$USER, avoiding file conflicts.

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/coverage.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 Kestrel/Eagle to make sure it all works if you made changes that will affect Kestrel/Eagle
• [ ] Add to the changelog_dev.rst file and propose migration text in the pull request

[github-actions[bot]]

File	Coverage
All files	87%	:white_check_mark:
base.py	92%	:white_check_mark:
exc.py	57%	:white_check_mark:
hpc.py	78%	:white_check_mark:
local.py	70%	:white_check_mark:
postprocessing.py	85%	:white_check_mark:
utils.py	92%	:white_check_mark:
cloud/docker_base.py	88%	: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/shared_testing_stuff.py	85%	:white_check_mark:
test/test_docker.py	33%	:white_check_mark:
test/test_local.py	97%	: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%

Generated by :monkey: cobertura-action against 1748ec9229ad9682256e57b12cbb5a90f1c49e05

[nmerket]

Are we feeling like this is ready to merge? I'd like to get this into a release so people can benefit from these bugfixes.

[asparke2]

@nmerket yeah, it's good to go, we used it for the Com EUSS runs