Restructure ARM template and UI form into ppe/prod folders (#11)

* Restructure ARM template and UI form into ppe/prod folders

Move existing ARM template and UI form definitions into dedicated prod/
subfolders, and add new ppe/ variants so both environments can be
supported side by side.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add Subscriptions dataset option to PPE UI form

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Saumitra Rawat (from Dev Box) <saurawat@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people