DM-37873: Fix code to remove obscore manager in makeRepo

[timj]

Checklist

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

[codecov]

Codecov Report

Base: 85.56% // Head: 85.56% // No change to project coverage 👍

Coverage data is based on head (3ed6faa) compared to base (356a7da).
Patch coverage: 33.33% of modified lines in pull request are covered.

❗ Current head 3ed6faa differs from pull request most recent head a533ab8. Consider uploading reports for the commit a533ab8 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #779   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         269      269           
  Lines       35279    35279           
  Branches     6026     6026           
=======================================
  Hits        30188    30188           
  Misses       3775     3775           
  Partials     1316     1316           

Impacted Files	Coverage Δ
python/lsst/daf/butler/_butler.py	78.61% <0.00%> (ø)
python/lsst/daf/butler/tests/_datasetsHelper.py	84.05% <0.00%> (ø)
python/lsst/daf/butler/core/datasets/ref.py	83.06% <100.00%> (ø)

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[andy-slac]

Looks good.