refactor: use slices.Contains to simplify code

[jinjingroad]

Changes

In Go 1.21, the standard library includes built-in max/min function, which can greatly simplify the code.

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[PuneetPunamiya]

/approve

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This pull-request has been approved by: lcarva, PuneetPunamiya

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[lcarva]

It seems there are some issues in test/clients.go which is unrelated to this PR. Merging.