(#2712) Normalize ExitCode pester tests

[corbob]

Description Of Changes

Normalize the exit code checking of the Pester tests.

Motivation and Context

This normalizes the exit code checking of the pester tests so that if they don't return as expected we have the output of the command.

Testing

Ran through Test Kitchen in Team City (see link to gep13 in Slack)

Operating Systems Testing

Windows Server 2016/2019

Change Types Made

• [ ] Bug fix (non-breaking change).
• [ ] Feature / Enhancement (non-breaking change).
• [ ] Breaking change (fix or feature that could cause existing functionality to change).
• [ ] Documentation changes.
• [ ] PowerShell code changes.
• [x] Pester test changes

Change Checklist

• [ ] Requires a change to the documentation.
• [ ] Documentation has been updated.
• [ ] Tests to cover my changes, have been added.
• [x] All new and existing tests passed?
• [ ] PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

• Related to #2712

[gep13]

@corbob thank you for getting these fixed up! This is going to help a LOT!