Enable PSSA to check for missing function comments

[james-garriss]

💡 Summary

PowerShell functions should have help comments. This issue enables PSSA to check for the existence of the functions, though not the syntax.

Motivation and context

Good programmers document their code. Bad programmers make excuses.

Implementation notes

• Update the PSSA config

Acceptance criteria

How do we know when this work is done?

• The CI and workflow pipelines will report functions that have missing help comments.