core/txpool/legacypool: fix stale counter #33653

[gzliudan]

Proposed changes

Ref: ethereum#33653

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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

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• Consensus
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• Geth
• Smart Contract
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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
• 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 attempts to fix a stale counter issue in the transaction pool's legacy pool implementation by adding a call to pool.priced.Removed() in the demoteUnexecutables() function.

Changes:

• Adds a pool.priced.Removed(len(olds) + len(drops)) call after processing invalid transactions in demoteUnexecutables()

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