DM-35815: Use StorageClassFactory.findStorageClass

[timj]

Requires lsst/daf_butler#721

Checklist

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

[codecov]

Codecov Report

Merging #271 (7014310) into main (cb57194) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 7014310 differs from pull request most recent head 333ed0b. Consider uploading reports for the commit 333ed0b to get more accurate results

@@            Coverage Diff             @@
##             main     #271      +/-   ##
==========================================
- Coverage   81.98%   81.90%   -0.08%     
==========================================
  Files          59       59              
  Lines        6078     6074       -4     
  Branches     1239     1237       -2     
==========================================
- Hits         4983     4975       -8     
- Misses        869      871       +2     
- Partials      226      228       +2     

Impacted Files	Coverage Δ
python/lsst/pipe/base/_dataset_handle.py	100.00% <100.00%> (ø)
tests/test_dataset_handle.py	96.42% <100.00%> (ø)
tests/test_quantumGraph.py	95.13% <0.00%> (-0.70%)	⬇️
python/lsst/pipe/base/graph/graph.py	80.34% <0.00%> (-0.57%)	⬇️

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