feat(core/txpool): improve error responses #30715

[gzliudan]

Proposed changes

Ref: ethereum#30715

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• Consensus
• Account
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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
• 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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[Copilot]

Pull request overview

This PR improves transaction validation error reporting in the txpool by preserving the underlying sender-recovery failure reason instead of returning a generic ErrInvalidSender, making RPC/user-facing diagnostics more informative.

Changes:

• Wrap ErrInvalidSender with the original types.Sender error to expose the concrete failure reason in the returned error string.
• Preserve errors.Is(err, ErrInvalidSender) semantics via %w wrapping.

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