Update logging setup and add tests

[adammcdonagh]

Fixes to logging to ensure that setting OTF_LOG_LEVEL cascades to the root logger.

This was preventing botocore in the AWS addon from logging at DEBUG level when log level was set via the environment variable rather than via the CLI arg.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.03%. Comparing base (25a76c8) to head (7304eb0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   89.02%   89.03%           
=======================================
  Files          22       22           
  Lines        2706     2708    +2     
=======================================
+ Hits         2409     2411    +2     
  Misses        297      297           

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