rpc: fix a flaky test of the websocket #33002

[wit765]

Proposed changes

Fix a flaky test of the websocket

Ref: ethereum#33002

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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Pull request overview

This PR fixes a flaky websocket test by ensuring a minimum timeout threshold for connection termination in the test helper code. The flakiness was caused by extremely short random timeouts (including near-zero values) that would kill connections too quickly, leading to unpredictable test behavior.

Key Changes:

• Added a minimum timeout of 10 milliseconds to the flakeyListener.Accept() method to prevent connections from being killed too quickly during testing

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