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/reducers/connections.tsx

@@ -18,7 +18,6 @@ import type {
   Logger,
   FlipperServer,
 } from 'flipper-common';
-import {performance} from 'perf_hooks';
 import type {Actions} from '.';
 import {WelcomeScreenStaticView} from '../sandy-chrome/WelcomeScreen';
 import {isDevicePluginDefinition} from '../utils/pluginUtils';