[FEA]: Add a pre-flight check when `pe_count > os.cpu_count()`

[dagardner-nv]

Is this a new feature, an improvement, or a change to existing functionality?

Improvement

How would you describe the priority of this feature request

High

Please provide a clear description of problem this feature solves

It would be nice to catch this early and give the user a descriptive error

Describe your ideal solution

n/a

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I have searched the open feature requests and have found no duplicates for this feature request