refactor: remove admin cli in token bridge deployment

[alxdca]

Summary

• Replace the admin CLI child token bridge deployment path with direct @arbitrum/chain-sdk calls.
• Generate bridgeUiConfig.json locally from SDK-returned or fetched token bridge contracts.
• Preserve partial-deploy recovery by fetching existing token bridge contracts when retry reports an already-deployed bridge.
• Await async snapshot semantic verification in snapshot commands.

Why / Context

• The token bridge flow no longer needs ARBITRUM_ADMIN_CLI_ENTRY or a Node 20 admin CLI subprocess for child bridge deployment.