DM-33226: Modify applyConfigOverrides to be able to use ResourcePath URIs

[timj]

Depends on lsst/pex_config#131

Checklist

• ran Jenkins
• ran and inspected package-docs build
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.95%. Comparing base (a7ddef1) to head (6b8e12c).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/pipe/base/_instrument.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
- Coverage   88.95%   88.95%   -0.01%     
==========================================
  Files         153      153              
  Lines       21004    21005       +1     
  Branches     2482     2482              
==========================================
  Hits        18685    18685              
- Misses       1736     1737       +1     
  Partials      583      583              

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