tests: fix flaky log test

[glevco]

Motivation

The test_non_signaling_features_warning() test was flaky. This PR tries to fix this. Before, it used capture_logs() from structlog. I believe the flakiness reason was related to that (maybe because it's not thread-safe).

Acceptance Criteria

• Change test_non_signaling_features_warning() to use a standard mock instead of capturing logs.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f515f6d) 84.60% compared to head (613d0ac) 84.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
- Coverage   84.60%   84.55%   -0.05%     
==========================================
  Files         269      269              
  Lines       22223    22223              
  Branches     3398     3398              
==========================================
- Hits        18802    18791      -11     
- Misses       2755     2762       +7     
- Partials      666      670       +4     

see 5 files with indirect coverage changes

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