refactor: using slices.Contains to simplify the code

[sjtucoder]

Description

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

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Breaking changes

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Nodes audience

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Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply

Cross repository changes

• This PR requires changes to bor
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• This PR requires changes to matic-cli
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Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai or amoy
• I have created new e2e tests into express-cli

Manual tests

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Additional comments

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[avalkov]

Please open PR to develop instead of master.

[sjtucoder]

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

Thanks. The new pr #1236