Add audit_unenrolled_* attributes to fleet-agents template (#111909)

Author: michel-laterman

x-pack/plugin/core/template-resources/src/main/resources/fleet-agents.json

@@ -319,6 +319,12 @@
         },
         "namespaces": {
           "type": "keyword"
+        },
+        "audit_unenrolled_time": {
+          "type": "date"
+        },
+        "audit_unenrolled_reason": {
+          "type": "keyword"
         }
       }
     }