test: add cold log event assert

[mmetc]

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[github-actions]

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• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.82%. Comparing base (c17d422) to head (ba4fed5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3577      +/-   ##
==========================================
- Coverage   57.85%   57.82%   -0.04%     
==========================================
  Files         391      391              
  Lines       43801    43801              
==========================================
- Hits        25343    25326      -17     
- Misses      16317    16329      +12     
- Partials     2141     2146       +5     

Flag	Coverage Δ
bats	42.74% <ø> (-0.04%)	⬇️
unit-linux	32.90% <ø> (-0.03%)	⬇️
unit-windows	22.63% <ø> (-0.01%)	⬇️

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