op-node: Alphabetize CLI network lists

[mbaxter]

Description

Alphabetize the list of networks returned from AvailableNetworks(). This list is used to display available networks in a few different CLIs. For example, ./bin/op-program --help now displays an alphabetized list of networks for its --network flag:

    --network value                                                        ($OP_PROGRAM_NETWORK)
          Predefined network selection. Available networks: base-devnet-0-sepolia-dev-0,
          base-mainnet, base-sepolia, lyra-mainnet, metal-mainnet, metal-sepolia,
          mode-mainnet, mode-sepolia, op-mainnet, op-sepolia,
          oplabs-devnet-0-sepolia-dev-0, orderly-mainnet, race-mainnet, race-sepolia,
          tbn-mainnet, zora-mainnet, zora-sepolia