DM-53944: Improve handling of job environment settings.

[MichelleGower]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 96.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.36%. Comparing base (47d12e1) to head (9b31a3f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/bps/transform.py	91.66%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   90.31%   90.36%   +0.04%     
==========================================
  Files          51       51              
  Lines        5545     5615      +70     
  Branches      540      552      +12     
==========================================
+ Hits         5008     5074      +66     
- Misses        438      441       +3     
- Partials       99      100       +1     

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