chore: refactor op e2e tests - part 6

[lesterli]

Summary

This PR adds the OP e2e test case TestFinalityProviderHasPower as part of the refactor in #178

Test Plan

make lint
make test-e2e-op-filter FILTER=TestFinalityProviderHasPower

    op_test_manager.go:327: [13:11:39.398] Registered Finality Provider da7b857d26f41f6d7d873f6f7b09f38fe2a8806ab811ab792762e816aa2cf5f6 for op-stack-l2-706114
    base_test_manager.go:185: successfully submitted a BTC delegation
    base_test_manager.go:236: delegations are active
2024-12-04T13:12:05.026+0800    DEBUG   opstackl2/consumer.go:259       FP last committed public randomness     {"height": 1000}
    op_test_manager.go:399: Stopping test manager
--- PASS: TestFinalityProviderHasPower (64.50s)
PASS
ok      github.com/babylonlabs-io/finality-provider/itest/opstackl2     66.234s