Conformance test timings aren't logged

[mboersma]

/kind bug

What steps did you take and what happened:

When running the conformance tests, the new Experiment / stopwatch approach in
#2941 doesn't seem to log the test durations anywhere, although the Gomega docs say it should be there.

[mboersma]

/priority important-soon

This is a regression, so it should be fixed soon.

[CecileRobertMichon]

/help

[k8s-ci-robot]

@CecileRobertMichon:
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