No way to start a batch over after a run fails fatally

After a fatal run error the Upload step offers a single Retry, which resumes. The telemetry branch had a 'Start over + Resume upload' pair for the error phase, but main's wider partial-or-error Retry branch shadowed it and the unreachable copy was removed during reconciliation. Decide whether the error phase should offer Start over again; the clean shape is an error branch ahead of the partial one, which also renames the button a user sees from Retry to Resume upload.

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User story: [AL2 Retry a failed upload to the same destination](https://github.com/CulverLab/sparcd-requirements/wiki/User-Stories#story-al2--retry-a-failed-upload-to-the-same-destination)