etcdserver: replace ParseInt with Atoi in getClusterSize

[1911860538]

No description provided.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @1911860538. 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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[henrybear327]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (316991e) to head (b42a131).
Report is 142 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdserver/api/v3discovery/discovery.go	67.80% <100.00%> (ø)

... and 41 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19714      +/-   ##
==========================================
- Coverage   68.84%   68.83%   -0.02%     
==========================================
  Files         421      421              
  Lines       35901    35857      -44     
==========================================
- Hits        24717    24681      -36     
+ Misses       9757     9744      -13     
- Partials     1427     1432       +5     

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