DM-39628: Add find_outside_stacklevel function

[timj]

Checklist

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

[codecov]

Codecov Report

Patch coverage: 95.12% and project coverage change: +0.05 🎉

Comparison is base (f7a7501) 93.89% compared to head (89d5a21) 93.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
+ Coverage   93.89%   93.94%   +0.05%     
==========================================
  Files          43       43              
  Lines        2801     2826      +25     
==========================================
+ Hits         2630     2655      +25     
  Misses        171      171              

Impacted Files	Coverage Δ
python/lsst/utils/ellipsis.py	100.00% <ø> (ø)
python/lsst/utils/introspection.py	97.05% <87.50%> (-2.95%)	⬇️
python/lsst/utils/timer.py	99.25% <100.00%> (+1.30%)	⬆️
tests/import_test/two/three/success.py	100.00% <100.00%> (ø)
tests/test_introspection.py	100.00% <100.00%> (ø)

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[ktlim]

Seems OK.