feat: Adding precondition checks for management groups (#69)

* feat: Adding precondition checks for management groups

* fix: removing extra try

* feat: adding preprocessing for validation

* fix: terraform fmt

* fix: update sandbox archetyps for latest ALZ lib

* fix: remove unneeded jsonencode

* fix: updating json to hcl

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Co-authored-by: sdeguchi <sdeguchi@microsoft.com>
Co-authored-by: Jared Holgate <jaredholgate@microsoft.com>

Author: 3 people