flags: optimise memory allocation

[arturmelanchyk]

This PR introduces tiny optimizations by specifying len in make(map...) statements

[k8s-ci-robot]

Hi @arturmelanchyk. Thanks for your PR.

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[ahrtr]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, arturmelanchyk

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.84%. Comparing base (ce4b4e5) to head (dcbd309).
Report is 30 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/flags/selective_string.go	100.00% <100.00%> (ø)
pkg/flags/unique_strings.go	92.00% <100.00%> (+0.33%)	⬆️

... and 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19201      +/-   ##
==========================================
+ Coverage   68.82%   68.84%   +0.02%     
==========================================
  Files         420      420              
  Lines       35627    35628       +1     
==========================================
+ Hits        24519    24528       +9     
+ Misses       9688     9678      -10     
- Partials     1420     1422       +2     

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[serathius]

/retest

[arturmelanchyk]

/retest

[serathius]

/retest

[serathius]

/retest