DM-38062: Allow logging tests to pass even if pytest is changing the root log level

[timj]

Checklist

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

[codecov]

Codecov Report

Base: 92.37% // Head: 92.38% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (9ea1a54) compared to base (9926e89).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #146   +/-   ##
=======================================
  Coverage   92.37%   92.38%           
=======================================
  Files          41       41           
  Lines        2637     2638    +1     
=======================================
+ Hits         2436     2437    +1     
  Misses        201      201           

Impacted Files	Coverage Δ
tests/test_logging.py	98.83% <100.00%> (+0.01%)	⬆️

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