fix(core/txpool): clarify tx validation error messages #29081

[gzliudan]

Proposed changes

Adjust txpool validation error wording to report actual and minimum values consistently.

• intrinsic gas error now reports: gas , minimum needed

• underpriced tip error now reports: gas tip cap , minimum needed

No transaction validation logic is changed in this commit; only error message text is updated.

Ref: ethereum#29081

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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
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• 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 standardizes the wording of transaction validation error messages in core/txpool/validation.go to consistently report the actual value first and the minimum required value second, using the format <field> <actual>, minimum needed <required>.

Changes:

• Reworded intrinsic gas error to report gas <actual>, minimum needed <required> (was needed <required>, allowed <actual>).
• Reworded underpriced tip errors (both for special transactions and normal transactions) to report gas tip cap <actual>, minimum needed <required> (was tip needed <required>, tip permitted <actual>).

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