make integration test more stable

[yihuang]

Proposal: make integration test more stable

Current behavior: [What currently happens]

Currently the integration tests almost always fail even on main branch, it's hard to tell if there's real issue:
https://github.com/evmos/ethermint/actions/workflows/test.yml?query=branch%3Amain

Desired behavior: make integration test more stable

Use case: [Why is this important (helps with prioritizing requests)]

Requests may be closed if we're not actively planning to work on them.