Fix: updates for integration deployment scripts

[lesterli]

Summary

This PR updated the config files and codes to fix the op devnet setup issues in the integration deployment scripts.

• The scheme http:// is not needed for babylonFinalityGadgetRpc in the devnetL1-template.json
• Add networks for the service l2 and op-node to make sure the service finality-gadget under the network artifacts_localnet can access each other
• Fix the logging panic issue: index out of range

Test Plan

make lint-go
cd op-node
make test

Test it by running the integration deployment scripts:

git clone [email protected]:babylonlabs-io/babylon-integration-deployment.git
cd babylon-integration-deployment
git submodule init && git submodule update

make start-deployment-finality-gadget-integration-op-l2-demo