Default to native view configs in bridged mode and to static view configs in bridgeless mode (#39704)

Summary:
Pull Request resolved: facebook/react-native#39704

Default to native view configs in bridged mode and to static view configs in bridgeless mode.
Remove `setRuntimeConfigProvider` calls from RNTester and from the Template.
Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D49687252

fbshipit-source-id: 140e1c510ba3fbc153978b59c8bb4b4e35bc7571

Original-Commit: facebook/react-native@b27fab7

Author: dmytrorykun

template/template/index.js

@@ -6,13 +6,4 @@ import {AppRegistry} from 'react-native';
 import App from './App';
 import {name as appName} from './app.json';
 
-if (global.RN$Bridgeless) {
-  require('react-native/Libraries/NativeComponent/NativeComponentRegistry').setRuntimeConfigProvider(
-    name => {
-      // In bridgeless mode, never load native ViewConfig.
-      return {native: false, strict: false, verify: false};
-    },
-  );
-}
-
 AppRegistry.registerComponent(appName, () => App);