refactor: use slices.Contains to simplify code

[xiaoxiangirl]

There is a new function added in the go1.21 standard library, which can make the code more concise and easy to read.

[k8s-ci-robot]

Hi @xiaoxiangirl. 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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[ahrtr]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.53%. Comparing base (5dfd6e0) to head (745f31c).
Report is 4 commits behind head on main.

Additional details and impacted files

see 155 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20185      +/-   ##
==========================================
- Coverage   69.10%   62.53%   -6.57%     
==========================================
  Files         410      401       -9     
  Lines       34232    33295     -937     
==========================================
- Hits        23656    20822    -2834     
- Misses       9166    10911    +1745     
- Partials     1410     1562     +152     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, jmhbnz, xiaoxiangirl

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