EVM/node: nit refactorisation of the validation module

Checklist

- [ ] Provide automatic testing. - [ ] Add an item in the changelog

What, why and how

meta-issue #7785

nit refactoration of the validation module.

Manually testing the MR

test are enough

Summary by CodeRabbit

• New Features

  • Introduced a unified mechanism to decode raw transaction data, enabling support for multiple transaction formats from a single entry point.

• Refactor

  • Streamlined transaction validation by consolidating fee and cost checks into one coherent process, reducing redundancy and simplifying validations.