```marketplace offer plan technical-configuration package add``` - include arm-ttk validation prior to upload

[dciborow]

I like this idea, but this will add complexity to the install process. ARM-TTK requires PowerShell on Linux.

When installing ARM-TTK, we have to install the same version used by the Marketplace team, found here: aka.ms/arm-ttk-marketplace

Historically, we have done this separately during our PR process which can be used while this feature is under discussion. https://github.com/microsoft/commercial-marketplace-offer-solution/blob/main/.github/actions/run-armttk/action.yml