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]

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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov-commenter]

Codecov Report

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

Project coverage is 68.73%. Comparing base (40b856e) to head (7215f6a).

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

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 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18859      +/-   ##
==========================================
- Coverage   68.77%   68.73%   -0.04%     
==========================================
  Files         420      420              
  Lines       35642    35642              
==========================================
- Hits        24513    24499      -14     
- Misses       9703     9712       +9     
- Partials     1426     1431       +5     

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[mmorel-35]

/assign @ahrtr

[ivanvc]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorel-35
Once this PR has been reviewed and has the lgtm label, please ask for approval from ahrtr. For more information see the Kubernetes Code Review Process.

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[mmorel-35]

/retest

[mmorel-35]

/retest