'[skip ci] upgrade React Native on a new RDT backend

Summary:
# Changelog: [Internal]

In React DevTools 6.0.0, settings manager is [no longer used](facebook/react#30986), because the host of the Backend is responsible for settings persistance.

Also,  call was removed from the top level of the JavaScript module and now we need to call  explicitly.

The logic for persisting settings will be added in one of the next diffs at the top.

Differential Revision: D62967059

packages/react-native/Libraries/Core/setUpReactDevTools.js

@@ -15,17 +15,22 @@ import type {Domain} from '../../src/private/fusebox/setUpFuseboxReactDevToolsDi
 if (__DEV__) {
   // Register dispatcher on global, which can be used later by Chrome DevTools frontend
   require('../../src/private/fusebox/setUpFuseboxReactDevToolsDispatcher');
+  const {
+    initialize,
+    connectToDevTools,
+    connectWithCustomMessagingProtocol,
+  } = require('react-devtools-core');
 
   // Install hook before React is loaded.
-  const reactDevTools = require('react-devtools-core');
+  initialize();
+
   // This should be defined in DEV, otherwise error is expected.
   const fuseboxReactDevToolsDispatcher =
     global.__FUSEBOX_REACT_DEVTOOLS_DISPATCHER__;
   const reactDevToolsFuseboxGlobalBindingName =
     fuseboxReactDevToolsDispatcher.BINDING_NAME;
 
   const ReactNativeStyleAttributes = require('../Components/View/ReactNativeStyleAttributes');
-  const devToolsSettingsManager = require('../DevToolsSettings/DevToolsSettingsManager');
   const resolveRNStyle = require('../StyleSheet/flattenStyle');
 
   let disconnect = null;
@@ -37,7 +42,7 @@ if (__DEV__) {
   }
 
   function connectToReactDevToolsInFusebox(domain: Domain) {
-    disconnect = reactDevTools.connectWithCustomMessagingProtocol({
+    disconnect = connectWithCustomMessagingProtocol({
       onSubscribe: listener => {
         domain.onMessage.addEventListener(listener);
       },
@@ -47,7 +52,6 @@ if (__DEV__) {
       onMessage: (event, payload) => {
         domain.sendMessage({event, payload});
       },
-      settingsManager: devToolsSettingsManager,
       nativeStyleEditorValidAttributes: Object.keys(ReactNativeStyleAttributes),
       resolveRNStyle,
     });
@@ -101,14 +105,13 @@ if (__DEV__) {
         isWebSocketOpen = true;
       });
 
-      reactDevTools.connectToDevTools({
+      connectToDevTools({
         isAppActive,
         resolveRNStyle,
         nativeStyleEditorValidAttributes: Object.keys(
           ReactNativeStyleAttributes,
         ),
         websocket: ws,
-        devToolsSettingsManager,
       });
     }
   }