chore: Refactor OTEL bridge signals setup

[jsumners-nr]

This PR resolves #3240.

[codecov]

Codecov Report

❌ Patch coverage is 98.86686% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.61%. Comparing base (960d169) to head (35408e5).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/otel/setup-signal.js	89.18%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3244      +/-   ##
==========================================
- Coverage   97.66%   97.61%   -0.06%     
==========================================
  Files         345      347       +2     
  Lines       51757    51824      +67     
==========================================
+ Hits        50549    50587      +38     
- Misses       1208     1237      +29     

Flag	Coverage Δ
integration-tests-cjs-20.x	73.95% <98.01%> (+0.02%)	⬆️
integration-tests-cjs-22.x	73.99% <98.01%> (+0.02%)	⬆️
integration-tests-cjs-24.x	74.73% <98.01%> (+0.02%)	⬆️
integration-tests-esm-20.x	49.46% <46.17%> (-0.01%)	⬇️
integration-tests-esm-22.x	49.53% <46.45%> (-0.01%)	⬇️
integration-tests-esm-24.x	51.24% <48.15%> (+<0.01%)	⬆️
unit-tests-20.x	88.31% <78.18%> (+<0.01%)	⬆️
unit-tests-22.x	88.32% <78.18%> (+<0.01%)	⬆️
unit-tests-24.x	88.36% <78.18%> (+<0.01%)	⬆️
versioned-tests-20.x	80.24% <70.82%> (-0.18%)	⬇️
versioned-tests-22.x	80.25% <70.82%> (-0.18%)	⬇️
versioned-tests-24.x	80.15% <70.82%> (-0.18%)	⬇️

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