[BUG] Child process monitoring does not work when parent procs have only one descendant.

[GitTorre]

Describe the bug
Due to a bug in the logic that ensures that pids are unique in the child proc list for a target parent pid, any proc that has only one child is considered to have no children.

To Reproduce
Create service that launches a single child process.

Expected behavior
FO monitors the single child process.

Desktop (please complete the following information):

• OS: Windows and Linux
• Version: Windows Server 2019/2022 and Ubuntu 18.04/20.04

Additional context
There is no way to configure your way out of this bug. It will require shipping an updated version of FO. If you don't monitor child processes, then this is not important to you. If you do, you will need to upgrade when the fix is released.