Add help comments to all PowerShell functions

[james-garriss]

💡 Summary

We currently have 148 PowerShell functions that do not have a help comment. (Major ouch!) This issue is about adding the missing comments. The complete list of functions can be found by running the pipelines. Here's one example:

https://github.com/cisagov/ScubaGear/actions/runs/12484842615/job/34842826197

This issue is a follow-on to #1489.

Motivation and context

Good programmers document their code. Bad programmers make excuses.

Implementation notes

• Find each function that is missing a help comment.
• Add a synopsis as a bare minimum.
• Preferably add complete comment.

Acceptance criteria

How do we know when this work is done?

• All functions have help comments.