Force legacy search for network plugin

Summary: Uses legacy API `tableManagerRef.current?.setSearchValue` not currently available in power search

Reviewed By: LukeDefeo

Differential Revision: D50969833

fbshipit-source-id: c83d9dce24f5d7a37b6cc68e19da2ae5da374941

desktop/plugins/public/network/request-mocking/NetworkRouteManager.tsx

@@ -7,7 +7,11 @@
  * @format
  */
 
-import {Atom, DataTableManager, getFlipperLib} from 'flipper-plugin';
+import {
+  Atom,
+  DataTableManagerLegacy as DataTableManager,
+  getFlipperLib,
+} from 'flipper-plugin';
 import {createContext} from 'react';
 import {Header, Request} from '../types';