[discover ] Remove extra field list request (#168315)

## Summary

The data view picker reloads the field list when the data view is
changed. Discover also does this. It doesn't need to happen twice so
this removes the discover field list reload call.

Addresses #167221

src/plugins/discover/public/application/main/utils/resolve_data_view.ts

@@ -70,7 +70,7 @@ export async function loadDataView({
   let fetchedDataView: DataView | null = null;
   // try to fetch adhoc data view first
   try {
-    fetchedDataView = fetchId ? await dataViews.get(fetchId, false, true) : null;
+    fetchedDataView = fetchId ? await dataViews.get(fetchId) : null;
     if (fetchedDataView && !fetchedDataView.isPersisted()) {
       return {
         list: dataViewList || [],