test utils: check funnel presense using http request

[pavelnikonorov]

In CI/CD workflows, since Funnel is executed inside a Docker container, it won’t appear in the output of ps ax | grep funnel on the host system. Try accessing by an HTTP request instead.

ga4gh-sdk/lib/src/utils/test_utils.rs

Line 17 in 696d0ed

pub async fn ensure_funnel_running() -> String {