feat:Move and delete decomissioned subscriptions

[knuterik-ballestad]

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Description

When we remove a subscription using terraform, it is simply moved to the tenant root.
Isn't the management group "Decommisioned" in the ALZ mgmt-structure supposed to be the target location for such decomissioned subscriptions?

Describe the solution you'd like

I would like that the decomissioned subscriptions would be moved to the "Decommisioned"-folder after terraform removes them.
It would also be nice with functionality to clean up/remove them altogether after the "grace period" has ended.

[sturlabragason-devoteam]

Doesn't solve the above, but if you change the default management group to "Decommissioned" then all subscriptions removed from the config will get disabled and dropped there.

The caveat is that all newly create subscriptions also get placed there initially.

[matt-FFFFFF]

Upon destroy, the AzureRM provider will cancel and move the sub to the default MG.

If you use the new AzAPI option you have more control but you must orchestrate this outside the module.