test: op e2e verifier daemon itest

[parketh]

Summary

This PR adds integration tests for the new verifier daemon in babylon-finality-gadget, a stateful program used to track consecutive quorum and query the latest BTC-finalized block.

• feature overview: https://github.com/babylonchain/pm-integration/issues/8
• implementation: https://github.com/babylonchain/babylon-finality-gadget/pull/62

Test Plan

make lint
make test-e2e-op