cl/12228 did enable automatic retries for some flaky tests, which
generally did work, as can be seen in
https://buildkite.com/tvl/depot/builds/35893
However, "🦆" still reports as failing, because we check the number
of steps to be nonzero, which is not the case if retries have happened.
We cannot check for the overall status of the build, as it's still
"RUNNING", but instead of counting all failed steps so far, we can query
all failed jobs and then filter out the ones that were already retried.
Change-Id: Ib9d27587c8a8ba7970850812c4302fecdc4482e7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12233
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
bb5d7c9678