Vote count for v5 extrinsics, specifically on Westend

[ErakhtinB]

Referenced issues

Description of the Change

Possible Drawbacks

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[Copilot]

Pull Request Overview

This PR introduces support for v5 extrinsics in the parachain vote count processing on Westend by adding new constants and refactoring the extrinsic decoding logic. Key changes include:

• Adding v5-specific extrinsic version and call constants.
• Refactoring the extrinsic decoding logic with a lambda that handles version selection.
• Updating the type of the persisted validation data reference to be const.

Comments suppressed due to low confidence (1)

core/parachain/validator/impl/parachain_processor.cpp:3507

• The parameter 'version_str' in the lambda is currently unused; consider removing it or incorporating it into error logging to improve clarity.

const auto tryDecodeExtrinsic = [&](uint8_t version, uint8_t call, const char *version_str) -> std::optional<parachain::ParachainInherentData> {