Preserve postmortem directory structure in ZAP reports (e.g. prevent multiple worker reports from overlapping)

Each component post mortem directory is created a a datestamped directory within a pod named dir.,
The current zap report mechanism is only keeping the sub datastamped directory, this means multiple reports from different components that happened at the same time (within a second) are folded together since they'll have the same sub-directory name.

Change so it preserves the whole postmortem subdir layout, i.e. keep the podname dir. the postmortem process creates too.