Enhancement: use datasets for truenas pools (#4716)

src/widgets/truenas/widget.js

@@ -23,11 +23,11 @@ const widget = {
           id: entry.name,
           name: entry.name,
           healthy: entry.healthy,
-          allocated: entry.allocated,
-          free: entry.free,
-          data: entry.topology?.data ?? [],
         })),
     },
+    dataset: {
+      endpoint: "pool/dataset",
+    },
   },
 };