DM-38235: Remove unused code related to schema digest calculation

[andy-slac]

Schema digests will no longer be written to butler_attributes table when registry database is initialized. The version of the DefaultButlerAttributeManager switched to 1.0.1, which is fully compatible with previous 1.0.0. daf_butler_migrate will add a migration script for 1.0.1.

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: -0.05 ⚠️

Comparison is base (edd49df) 85.62% compared to head (6d15238) 85.57%.

❗ Current head 6d15238 differs from pull request most recent head a10d057. Consider uploading reports for the commit a10d057 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #806      +/-   ##
==========================================
- Coverage   85.62%   85.57%   -0.05%     
==========================================
  Files         266      266              
  Lines       35380    35227     -153     
  Branches     7447     7401      -46     
==========================================
- Hits        30293    30146     -147     
- Misses       3755     3757       +2     
+ Partials     1332     1324       -8     

Impacted Files	Coverage Δ
...thon/lsst/daf/butler/registry/bridge/monolithic.py	87.25% <ø> (-0.25%)	⬇️
...on/lsst/daf/butler/registry/collections/nameKey.py	93.18% <ø> (-0.30%)	⬇️
...sst/daf/butler/registry/collections/synthIntKey.py	95.00% <ø> (-0.17%)	⬇️
.../butler/registry/datasets/byDimensions/_manager.py	91.87% <ø> (-0.09%)	⬇️
...thon/lsst/daf/butler/registry/dimensions/static.py	89.04% <ø> (-0.51%)	⬇️
...ython/lsst/daf/butler/registry/obscore/_manager.py	80.35% <ø> (-0.24%)	⬇️
python/lsst/daf/butler/registry/opaque.py	95.58% <ø> (-0.13%)	⬇️
python/lsst/daf/butler/tests/_dummyRegistry.py	87.64% <ø> (+1.61%)	⬆️
python/lsst/daf/butler/registry/attributes.py	100.00% <100.00%> (ø)
...lsst/daf/butler/registry/interfaces/_versioning.py	81.48% <100.00%> (-7.81%)	⬇️
... and 2 more

... and 10 files with indirect coverage changes

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[timj]

Can you add a "removal" news fragment for this please?