Add support for source_workstation in workstations_workstation resource. (#12549)

Author: esu

mmv1/products/workstations/Workstation.yaml

@@ -153,3 +153,9 @@ properties:
       - 'STATE_RUNNING'
       - 'STATE_STOPPING'
       - 'STATE_STOPPED'
+  - name: 'source_workstation'
+    type: String
+    description: |
+      Full resource name of the source workstation from which the workstation's persistent
+      directories will be cloned from during creation.
+    immutable: true