Update pricing for MONAD_SIX

[Baltoli]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the Monad virtual machine to introduce a new revision MONAD_SIX and shifts pricing changes that were previously assigned to MONAD_NEXT to this new revision. The main purpose is to formalize and version control pricing model updates.

Key Changes:

• Introduces MONAD_SIX as revision 6 and renumbers MONAD_NEXT to revision 7
• Moves pricing version 1 activation from MONAD_NEXT to MONAD_SIX
• Simplifies gas refund logic by removing MONAD_NEXT-specific conditional branches

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
category/vm/evm/monad/revision.h	Adds MONAD_SIX enum value and renumbers MONAD_NEXT
category/vm/evm/traits.hpp	Updates pricing version activation and removes obsolete trait methods
category/vm/evm/opcodes.hpp	Adds opcode table for MONAD_SIX and simplifies MONAD_NEXT table
category/vm/runtime/storage_costs.hpp	Updates storage cost tables to inherit from base traits
category/vm/evm/explicit_traits.hpp	Adds template instantiations for MONAD_SIX
category/execution/ethereum/execute_transaction.cpp	Simplifies gas refund logic by removing conditional branching
category/execution/monad/monad_transaction_gas.cpp	Removes MONAD_NEXT-specific gas refund computation
category/execution/ethereum/transaction_gas.cpp	Removes unused refund_gas_price function
category/execution/ethereum/transaction_gas.hpp	Removes refund_gas_price function declaration
category/execution/monad/monad_transaction_gas.hpp	Removes refund_gas_price function declaration
test/vm/unit/evm_tests.cpp	Removes obsolete block gas overflow test
category/rpc/eth_call_test.cpp	Updates expected gas usage in test
category/execution/ethereum/test/test_monad_chain.cpp	Removes MONAD_NEXT-specific test branch
category/execution/ethereum/execute_transaction_test.cpp	Removes MONAD_NEXT-specific refund expectations

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