DM-38954: Fix duplicate join terms in spatial queries involving common skypix.

[TallJimbo]

Checklist

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

[codecov]

Codecov Report

Patch coverage: 89.28% and project coverage change: +0.01 🎉

Comparison is base (87c2bcf) 87.74% compared to head (5916c8d) 87.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
+ Coverage   87.74%   87.76%   +0.01%     
==========================================
  Files         268      268              
  Lines       35154    35175      +21     
  Branches     7401     7407       +6     
==========================================
+ Hits        30846    30871      +25     
+ Misses       3155     3150       -5     
- Partials     1153     1154       +1     

Impacted Files	Coverage Δ
...lsst/daf/butler/registry/interfaces/_dimensions.py	97.29% <ø> (ø)
...lsst/daf/butler/registry/queries/_query_backend.py	92.30% <ø> (ø)
.../daf/butler/registry/queries/_sql_query_backend.py	86.40% <83.33%> (-0.47%)	⬇️
...thon/lsst/daf/butler/registry/dimensions/static.py	89.74% <88.23%> (-0.54%)	⬇️
python/lsst/daf/butler/registry/tests/_registry.py	98.25% <100.00%> (+<0.01%)	⬆️

... and 1 file with indirect coverage changes

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[andy-slac]

Looks good.

[andy-slac]

Can you revise this sentence, I think maybe "have" is missing somewhere, and having one "common" is probably enough?