TFNFR36 - Setting prevent_deletion_if_contains_resources

From Terraform AzureRM 3.0, the default value of prevent_deletion_if_contains_resources in provider block is true. This will lead to an unstable test because the test subscription has some policies applied, and they will add some extra resources during the run, which can cause failures during destroy of resource groups.

Since we cannot guarantee our testing environment won’t be applied some Azure Policy Remediation Tasks in the future, for a robust testing environment, prevent_deletion_if_contains_resources SHOULD be explicitly set to false.