Investigate flaky test_process_client_handling_stream_request_latest_voters_snapshot test

[sveitser]

This test is failing on the non-nix setup test:

https://github.com/EspressoSystems/espresso-sequencer/actions/runs/10343720578/job/28696131738

Probably because these don't run sequentially like the rest of the CI.

espresso-sequencer/doc/ubuntu.md

Line 46 in c75c813

cargo test --release --all-features -- --skip sql

Would be nice if we could make it work more reliably.