Change v2 mac_unopt orchestrator builder to Linux

Author: jmagman

.ci.yaml

@@ -368,6 +368,14 @@ targets:
       add_recipes_cq: "true"
     timeout: 60
 
+  - name: Linux mac_unopt
+    bringup: true
+    recipe: engine_v2/engine_v2
+    properties:
+      config_name: mac_unopt
+      add_recipes_cq: "true"
+    timeout: 60
+
   - name: Mac Unopt
     bringup: true
     recipe: engine/engine_unopt