chore: Mark "breaker" as obsolete

[wmazur-splunk]

"Breaker" variable shall be considered discouraged since it takes TA's work to break the events. This way we do not test add-on but samples config.

[codecov-commenter]

Codecov Report

Merging #715 (18a01d2) into develop (1eec65a) will decrease coverage by 0.01%.
The diff coverage is 83.33%.

@@             Coverage Diff             @@
##           develop     #715      +/-   ##
===========================================
- Coverage    86.86%   86.84%   -0.02%     
===========================================
  Files           51       51              
  Lines         2771     2775       +4     
===========================================
+ Hits          2407     2410       +3     
- Misses         364      365       +1     

Impacted Files	Coverage Δ
...on/standard_lib/sample_generation/sample_stanza.py	88.46% <80.00%> (-0.32%)	⬇️
...k_addon/standard_lib/index_tests/test_generator.py	100.00% <100.00%> (ø)

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[uoboda-splunk]

Please fix pre-commit