The internal Group Policy cache does not use a unique key and ends up returning MachinePolicy ExecutionPolicy for a UserPolicy query.

Update the cache code to use a fully unique key.

Investigate using a Tuple instead of concatenated string for the cache key to improve performance.

Steps to reproduce

Set Group Policy UserPolicy, ExecutionPolicy to RemoteSigned
Start new PowerShell session
Run 'Get-ExecutionPolicy -List'

Expected behavior

ExecutionPolicy UserPolicy set to RemoteSigned

Actual behavior

ExecutionPolicy UserPolicy set to Undefined