DM-35446: Follow directory symlinks when walking

[timj]

Checklist

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

[codecov]

Codecov Report

Merging #25 (773e0dd) into main (3c78941) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   86.21%   86.21%           
=======================================
  Files          22       22           
  Lines        2727     2727           
  Branches      542      542           
=======================================
  Hits         2351     2351           
  Misses        297      297           
  Partials       79       79           

Impacted Files	Coverage Δ
python/lsst/resources/file.py	88.88% <100.00%> (ø)

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