AWS Service Account

[nmerket]

Fixes #412 Merge after #405

Pull Request Description

Switching to a shared service account for Kestrel and Eagle.

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 Kestrel to make sure it all works if you made changes that will affect Kestrel
• [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:
exc.py	57%	:white_check_mark:
hpc.py	78%	:white_check_mark:
local.py	70%	:white_check_mark:
postprocessing.py	84%	:white_check_mark:
utils.py	91%	:white_check_mark:
cloud/docker_base.py	93%	: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_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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