op-program: Allow new named chains to be added without the op-geth config

[ajsutton]

Description

Allow new named chains to be added without the op-geth config required by the fault proof program.

Simplifies the bedrock migration and the new mainnet config can be added afterwards.

Metadata

https://linear.app/optimism/issue/CLI-3936/add-mainnet-chain-config-to-fpp logged to add the config post-migration and re-enable the test since newly created chains won't have the complication of migration so should just be added immediately.

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[Inphi]

LGTM!

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