Backport: Change sample size log from warn to debug

[kc1116]

Backport #6441

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 41.50%. Comparing base (0cd570f) to head (7c72bdf).

Files with missing lines	Patch %	Lines
...validation/control_message_validation_inspector.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            v0.37    #6460      +/-   ##
==========================================
- Coverage   41.50%   41.50%   -0.01%     
==========================================
  Files        2017     2017              
  Lines      143993   143993              
==========================================
- Hits        59759    59758       -1     
+ Misses      78033    78031       -2     
- Partials     6201     6204       +3     

Flag	Coverage Δ
unittests	41.50% <0.00%> (-0.01%)	⬇️

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