Get rid of perf_hooks package in Flipper UI

Summary:
perf_hooks is no longer needed as these APIs are widely available in both browser and electron.

Still needed in unit tests, as they run from Node

Reviewed By: lblasa, aigoncharov

Differential Revision: D32648253

fbshipit-source-id: 5718ea99b57f96f6858311fd0815ad18c476c99e

desktop/flipper-ui-core/src/utils/exportData.tsx

@@ -32,7 +32,6 @@ import {
   SupportFormRequestDetailsState,
 } from '../reducers/supportForm';
 import {deconstructClientId} from 'flipper-common';
-import {performance} from 'perf_hooks';
 import {processMessageQueue} from './messageQueue';
 import {getPluginTitle} from './pluginUtils';
 import {capture} from './screenshot';