fix(p2p/discover): bump failure counter only if no nodes were provided #19362

[gzliudan]

Proposed changes

This resolves a minor issue where neighbors responses containing less than 16 nodes would bump the failure counter, removing the node. One situation where this can happen is a private deployment where the total number of extant nodes is less than 16.

Issue found by @Jsying.

Ref: ethereum#19362

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• fix: A bug fix
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• test: Adding missing tests or correcting existing tests

Impacted Components

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• Geth
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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
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• 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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