DM-37703: Catch unresolved refs warnings and some workarounds

[timj]

Relies on lsst/daf_butler#821

Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.21 ⚠️

Comparison is base (bb2d212) 83.80% compared to head (c4a59f1) 83.60%.

❗ Current head c4a59f1 differs from pull request most recent head e3c9915. Consider uploading reports for the commit e3c9915 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   83.80%   83.60%   -0.21%     
==========================================
  Files          48       48              
  Lines        4527     4538      +11     
  Branches      814      819       +5     
==========================================
  Hits         3794     3794              
- Misses        547      557      +10     
- Partials      186      187       +1     

Impacted Files	Coverage Δ
tests/test_cmdLineFwk.py	97.58% <ø> (ø)
python/lsst/ctrl/mpexec/mock_task.py	86.81% <100.00%> (+0.60%)	⬆️
python/lsst/ctrl/mpexec/mpGraphExecutor.py	87.13% <100.00%> (+0.16%)	⬆️
python/lsst/ctrl/mpexec/preExecInit.py	69.30% <100.00%> (-0.16%)	⬇️
python/lsst/ctrl/mpexec/singleQuantumExecutor.py	70.30% <100.00%> (+0.45%)	⬆️

... and 1 file with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[andy-slac]

Looks good.