Remove fs and os usage from Mobile Builds plugin

Summary: Changelog: Expose env info and FS rm command to flipper plugins.

Reviewed By: mweststrate

Differential Revision: D32988478

fbshipit-source-id: 3d0233f9eb34d3478b07e39b9401c0e30ca95135

desktop/flipper-plugin/src/__tests__/api.node.tsx

@@ -70,6 +70,7 @@ test('Correct top level API exposed', () => {
       "usePlugin",
       "useTrackedCallback",
       "useValue",
+      "uuid",
       "withTrackingScope",
     ]
   `);