Pod row should detect when plank fails to create pod

[fejta]

If the pod cannot be created we will have a prowjob.json but no podinfo.json. Example:

https://prow.ci.openshift.org/view/gcs/origin-ci-test/logs/release-openshift-origin-installer-launch-azure/1370052156190625792

/assign

However right now the symptom this demonstrates is "podinfo.json not found please install GCS reporter"

[fejta]

Here's where we download podinfo.json, could extend to include prowjob.json and also process that:

testgrid/pkg/updater/read.go

Lines 341 to 358 in 410ba6a

	// Download podinfo.json
	work++
	go func() {
	pi, err := build.PodInfo(ctx, client)
	switch {
	case errors.Is(err, io.EOF):
	addMalformed("podinfo.json")
	err = nil
	case err != nil:
	err = fmt.Errorf("podinfo: %w", err)
	case pi != nil:
	result.podInfo = *pi
	}
	select {
	case <-ctx.Done():
	case ec <- err:
	}
	}()