test(eth/fetcher): tune flaky test #18508

[gzliudan]

Proposed changes

Ref: ethereum#18508

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• Consensus
• Account
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• Geth
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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
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[Copilot]

Pull request overview

This PR tweaks timing in the eth/fetcher test suite to reduce flakiness (ref ethereum#18508) by extending the “no import should happen” wait window in verifyImportEvent.

Changes:

• Increase the negative-case verifyImportEvent timeout from 10ms to 20ms to better accommodate scheduling variability.