Revert Abstract EIP712 domain changes

[cygaar]

It turns out, the zkSync domain name is hardcoded into the bootloader, meaning we can't change this domain in our code without modifying the node directly.

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PR-Codex overview

This PR reverts custom EIP712 domain changes in viem and removes related functions from abstractTestnet.

Detailed summary

• Reverted custom EIP712 domain changes in viem.
• Removed getEip712Domain function from abstractTestnet.
• Updated transactionToMessage to be an exported function in getEip712Domain.ts.

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Latest commit: dc5e2ff

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viem	Patch

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