fix: enable int-conversion rule of perfsprint

[mmorel-35]

This fixes int-conversion rule from perfsprint

This helps avoid unnecessary memory allocations.
It doesn't include server and tests folder as they have a lot of impacted files

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorel-35
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[k8s-ci-robot]

Hi @mmorel-35. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.

Project coverage is 68.81%. Comparing base (0f9c128) to head (24548fc).
Report is 2 commits behind head on main.

❗ Current head 24548fc differs from pull request most recent head 1e09dbe

Please upload reports for the commit 1e09dbe to get more accurate results.

Files with missing lines	Patch %	Lines
etcdctl/ctlv3/command/printer.go	0.00%	11 Missing ⚠️
etcdutl/etcdutl/printer.go	0.00%	6 Missing ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/report/timeseries.go	91.42% <100.00%> (ø)
etcdutl/etcdutl/printer.go	0.00% <0.00%> (ø)
etcdctl/ctlv3/command/printer.go	0.00% <0.00%> (ø)

... and 24 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #18859   +/-   ##
=======================================
  Coverage   68.80%   68.81%           
=======================================
  Files         420      420           
  Lines       35532    35532           
=======================================
+ Hits        24448    24451    +3     
+ Misses       9662     9657    -5     
- Partials     1422     1424    +2     

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[mmorel-35]

/assign @ahrtr

[ivanvc]

/ok-to-test