Add end-to-end tests for project module (#1823)

* Add end-to-end tests for project module
* Add inventory to data tests
* Add files to end-to-end test cases
* Review fixes - use named groups

---------

Co-authored-by: Ludovico Magnocavallo <ludomagno@google.com>

modules/compute-vm/README.md

@@ -516,7 +516,7 @@ module "kms-vm-example" {
   }
   encryption = {
     encrypt_boot      = true
-    kms_key_self_link = var.kms_key.self_link
+    kms_key_self_link = var.kms_key.id
   }
 }
 # tftest modules=1 resources=3 inventory=cmek.yaml