test: update dashboard URL detection logic for DashboardCmd test #10509
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Fixes #10504
PR #10462 changed logging some info from stderr to stdout. The DashboardCmd test checked stdout for the first line and would use that as the dashboard URL. The change in #10462 made new lines
(
-%20Using%20image%20kubernetesui/dashboard:v2.1.0
) output to stdout before the dashboard URL and tried to curl those messages, resulting in the test failing.This PR loops through the stdout messages until it finds a line that start with
http
and uses that as the dashboard URL.