Add executable gossip validation functions for heze

[jihoonsong]

This PR adds executable gossip message validation specs for Heze.

• Make p2p interface specifications executable/testable #4611
• Add executable gossip validation functions for phase0 #4902
• Add executable gossip validation functions for altair #5033
• Add executable gossip validation functions for bellatrix #5047
• Add executable gossip validation functions for capella #5049
• Add executable gossip validation functions for deneb #5146
• Add executable gossip validation functions for electra #5238
• Add executable gossip validation functions for fulu #5246
• Add executable gossip validation functions for gloas #5294

Here are the reference tests for all Heze gossip tests:

• reftests.tar.gz -- Updated Sep 5th 2026