Update PowerSTIG to refactor Pester tests structure/framework

[bcwilhite]

Is your feature request related to a problem? Please describe.

A new config structure was created with the vSphere support PR. This issue is to refactor all composite tests to follow that same structure/framework.

Describe the solution you'd like

A new config structure was created with the vSphere support PR. This issue is to refactor all composite tests to follow that same structure/framework.