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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.25%. Comparing base (52bbc02) to head (d0f4959).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   92.76%   93.25%   +0.48%     
==========================================
  Files          53       53              
  Lines        6459     6582     +123     
  Branches      571      582      +11     
==========================================
+ Hits         5992     6138     +146     
+ Misses        367      352      -15     
+ Partials      100       92       -8     

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