RNTester iOS: setup Meta internal app init logic (#41591)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/41591

For internal build integration, invoke Meta internal app setup logic. This has no effect in OSS.

Changelog: [Internal]

Reviewed By: christophpurrer

Differential Revision: D51498070

fbshipit-source-id: 48658d2c3136023d80fbd9a2fdc29996616e1eee

packages/rn-tester/RNTester/AppDelegate.mm

@@ -23,6 +23,11 @@
 #endif
 #endif
 
+// FB-internal imports
+#ifdef RN_DISABLE_OSS_PLUGIN_HEADER
+#import <RCTFBAppInit/RCTFBAppInit.h>
+#endif
+
 #if BUNDLE_PATH
 NSString *kBundlePath = @"xplat/js/RKJSModules/EntryPoints/RNTesterTestBundle.js";
 #else
@@ -33,6 +38,11 @@ NSString *kBundlePath = @"js/RNTesterApp.ios";
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
+#ifdef RN_DISABLE_OSS_PLUGIN_HEADER
+  // FB-internal app init setup.
+  RCTFBAppInitApplicationDidFinishLaunching(launchOptions);
+#endif
+
   self.moduleName = @"RNTesterApp";
   // You can add your custom initial props in the dictionary below.
   // They will be passed down to the ViewController used by React Native.