enhance: keylock object background recycling

[SimFG]

issue: #38587

[sre-ci-robot]

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 81.10%. Comparing base (4df444e) to head (a0bbcc8).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/util/lock/key_lock.go	80.00%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38805      +/-   ##
==========================================
+ Coverage   81.09%   81.10%   +0.01%     
==========================================
  Files        1383     1385       +2     
  Lines      195636   195847     +211     
==========================================
+ Hits       158642   158835     +193     
- Misses      31404    31410       +6     
- Partials     5590     5602      +12     

Components	Coverage Δ
Client	78.73% <ø> (+0.47%)	⬆️
Core	69.45% <ø> (+0.01%)	⬆️
Go	83.07% <80.00%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
pkg/util/lock/key_lock.go	83.65% <80.00%> (-6.22%)	⬇️

... and 36 files with indirect coverage changes

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