Remove SampleTurboCxxModule example (#52442)

Summary:
Pull Request resolved: #52442

Changelog: [Internal]

The sample is from an outdated approach of enabling C++ Modules in RN which is not recommended anymore.

Prefer C++ Turbo Modules if you need to expose / access C or C++ APIs in RN apps:

https://reactnative.dev/docs/the-new-architecture/pure-cxx-modules

It is not included in any RNTester app at this time

Reviewed By: cortinico

Differential Revision: D77771111

fbshipit-source-id: a4fe1d13fd0224babc46f54b921a036f7b237a48

Author: christophpurrer

packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon/NativeSampleTurboCxxModuleSpecJSI.cpp

@@ -0,0 +1,2 @@
+Refer to packages/rn-tester/NativeCxxModuleExample/NativeCxxModuleExample.h for a concrete example.
+See: https://reactnative.dev/docs/the-new-architecture/pure-cxx-modules

packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon/NativeSampleTurboCxxModuleSpecJSI.h

@@ -14,7 +14,6 @@
 #import <React/RCTLinkingManager.h>
 #import <ReactCommon/RCTSampleTurboModule.h>
 #import <ReactCommon/RCTTurboModuleManager.h>
-#import <ReactCommon/SampleTurboCxxModule.h>
 
 #import <React/RCTPushNotificationManager.h>
 
@@ -83,10 +82,6 @@ - (BOOL)application:(UIApplication *)app
 - (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:(const std::string &)name
                                                       jsInvoker:(std::shared_ptr<facebook::react::CallInvoker>)jsInvoker
 {
-  if (name == std::string([@"SampleTurboCxxModule" UTF8String])) {
-    return std::make_shared<facebook::react::SampleTurboCxxModule>(jsInvoker);
-  }
-
   if (name == facebook::react::NativeCxxModuleExample::kModuleName) {
     return std::make_shared<facebook::react::NativeCxxModuleExample>(jsInvoker);
   }