Update generator migration script to be a PowerShell script (Azure#51110)

* Initial plan

* Initial plan for migrating Python script to PowerShell

Co-authored-by: JoshLove-msft <[email protected]>

* Add PowerShell version of Library_Inventory script and update documentation

Co-authored-by: JoshLove-msft <[email protected]>

* Add Library_Inventory.json to .gitignore and complete migration

Co-authored-by: JoshLove-msft <[email protected]>

* Revert .gitignore change - script only creates JSON on explicit request

Co-authored-by: JoshLove-msft <[email protected]>

* Remove obsolete Python script after migration to PowerShell

Co-authored-by: live1206 <[email protected]>

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Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: JoshLove-msft <[email protected]>
Co-authored-by: live1206 <[email protected]>

Author: 3 people