refact leaky bayesian: method to function, unlock w/defer

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

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

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[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.05%. Comparing base (569271e) to head (7180b25).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/leakybucket/bayesian.go	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4242      +/-   ##
==========================================
- Coverage   63.09%   63.05%   -0.04%     
==========================================
  Files         471      471              
  Lines       33433    33430       -3     
==========================================
- Hits        21093    21079      -14     
- Misses      10221    10228       +7     
- Partials     2119     2123       +4     

Flag	Coverage Δ
bats	46.57% <0.00%> (+<0.01%)	⬆️
unit-linux	35.96% <90.00%> (-0.04%)	⬇️
unit-windows	24.34% <90.00%> (-0.02%)	⬇️

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[sabban]

lgtm