op-challenger, op-program: Require specific opt-in to use the custom config chain ID indicator (#13217)

* op-challenger: Support --cannon-l2-chain-id to pass chain ID through to op-program.

* op-program: Default to assuming configs are available in client.

Provide a --l2.custom flag to set the chain ID to the custom chain indicator so the client will load configs via the preimage oracle.
Since loading configs via the preimage oracle doesn't work on-chain, this is a safer and simpler default now that op-program can be built
with custom configs embedded.

* op-challenger: Switch to custom L2 flag instead of specifying chain ID

* op-challenger: Fix boolean option in op-program execution.

* op-e2e: Set custom L2 flag in precompiles test