enable xr tests

Signed-off-by: byrcolin <byrcolin@amazon.com>

.automatedtesting.json

@@ -14,5 +14,7 @@
     "REGISTER_RESTRICTED": [
     ],
     "ENABLE_GEMS": [
+        "Gems/XR",
+        "Gems/OpenXRVk"
     ]
 }