ci: AT hidden_paths is flaky

[matzf]

The hidden_paths integration test is flaky on the CI infrastructure. As far as I remember, this had not been flaky on the old buildkite AWS stack, only on the new infrastructure. Possibly it's just a small thing like adjusting a timeout value.

[jiceatscion]

#4398 includes an attempt at deflaking the hidden_path test. It was flaky on my own machine too; as soon as I switched to docker compose v2. My guess is that the slow starting of containers actually did provide some helpful delays in the right places. While tuning the delays I also noticed that switching my laptop to high performance made failure more likely.