DM-2850: Remove getSchemaCatalogs API

[timj]

Not used in gen3.

Checklist

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

[codecov]

Codecov Report

Base: 81.32% // Head: 81.38% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (a4f207f) compared to base (a524345).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head a4f207f differs from pull request most recent head ef6ab7c. Consider uploading reports for the commit ef6ab7c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
+ Coverage   81.32%   81.38%   +0.05%     
==========================================
  Files          57       57              
  Lines        6202     6193       -9     
  Branches     1143     1142       -1     
==========================================
- Hits         5044     5040       -4     
+ Misses        926      920       -6     
- Partials      232      233       +1     

Impacted Files	Coverage Δ
python/lsst/pipe/base/task.py	83.48% <ø> (+4.67%)	⬆️
python/lsst/pipe/base/tests/simpleQGraph.py	69.67% <ø> (ø)
python/lsst/pipe/base/connections.py	72.88% <100.00%> (ø)
python/lsst/pipe/base/pipelineIR.py	86.24% <100.00%> (ø)
python/lsst/pipe/base/graph/graph.py	81.57% <0.00%> (-0.55%)	⬇️

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[timj]

I'll fix that mypy problem -- it's triggered by the mypy 0.990 improvements and not related to this code change.