feat(CHAIN-3468): optimize pre-signed pause tasks

[jackchuma]

Summary

• Replace the pre-signed pause signing loops with direct Safe EIP-712 payload construction using cast.
• Call eip712sign -data for each nonce instead of invoking forge script, removing the forge startup/simulation latency from the 20-signature loop.
• Preserve the existing signature output files and execution flows.

Validation

• forge fmt --check setup-templates/template-pause-superchain-config/script/PauseSuperchainConfig.s.sol setup-templates/template-pause-bridge-base/script/PauseBridge.s.sol
• git diff --check
• Compared direct Safe payload construction against onchain Safe.encodeTransactionData for Sepolia SuperchainConfig pause
• Compared direct Safe payload construction against onchain Safe.encodeTransactionData for Sepolia bridge pause

[linear]

CHAIN-3468

[cb-heimdall]

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