track Pepr PID that are created during the fork

[cmwylie19]

Describe what should be investigated or refactored

For debugging purposes, we should track the PIDs that are created by pepr

Links to any relevant code

(optional) i.e. - https://github.com/defenseunicorns/pepr/blob/24f1f253b1db4c9d97717c0282b8f39c74d3ace1/README.md?plain=1#L3

Additional context

Add any other context or screenshots about the technical debt here.