Add AfterAll cleanup for stub functions in Pester tests

[Copilot]

• Analyze the feedback: only remove stub functions in AfterAll if they were created by BeforeAll
• Update BeforeAll to track which functions were added using script-scoped boolean flags
• Update AfterAll to only remove functions that were added by BeforeAll

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[Trenly]

@copilot The BeforeAll only creates the functions if they weren't existing before the tests - they should only be removed if they were added

[Copilot]

@copilot The BeforeAll only creates the functions if they weren't existing before the tests - they should only be removed if they were added

Fixed in eb3936e. Now each function tracks whether it was created by BeforeAll using a script-scoped boolean flag (e.g. $Script:AddedGetMSITable), and AfterAll only removes functions where that flag is $true.