Delete non C++ Turbo Module SampleCxxModule (#52407)

Summary:
Pull Request resolved: #52407

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The sample is from an outdated approach of enabling C++ Modules in RN which is not recommended anymore.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

Reviewed By: javache

Differential Revision: D77765443

fbshipit-source-id: 112fef4c1a7e1c567f3c1d471728a1dfc926adc6

Author: christophpurrer

packages/react-native/Package.swift

@@ -178,7 +178,7 @@ let reactCxxReact = RNTarget(
   name: .reactCxxReact,
   path: "ReactCommon/cxxreact",
   searchPaths: [CallInvokerPath],
-  excludedPaths: ["tests", "SampleCXXModule.cpp"],
+  excludedPaths: ["tests"],
   dependencies: [.reactNativeDependencies, .jsi, .reactPerfLogger, .logger, .reactDebug, .reactJsInspector]
 
 )

packages/react-native/ReactCommon/cxxreact/React-cxxreact.podspec

@@ -28,7 +28,6 @@ Pod::Spec.new do |s|
   s.platforms              = min_supported_versions
   s.source                 = source
   s.source_files           = podspec_sources("*.{cpp,h}", "*.h")
-  s.exclude_files          = "SampleCxxModule.*"
   s.pod_target_xcconfig    = {
     "HEADER_SEARCH_PATHS" => "\"$(PODS_CONFIGURATION_BUILD_DIR)/React-debug/React_debug.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-runtimeexecutor/React_runtimeexecutor.framework/Headers\"",
     "CLANG_CXX_LANGUAGE_STANDARD" => rct_cxx_language_standard()

packages/react-native/ReactCommon/cxxreact/SampleCxxModule.cpp

@@ -9216,34 +9216,6 @@ struct RecoverableError : public std::exception {
 };
 } // namespace facebook::react
 
-/// @src {packages/react-native/ReactCommon/cxxreact/SampleCxxModule.h}:
-namespace facebook {
-namespace xplat {
-namespace samples {
-class Sample {
- public:
-  std::string hello();
-  double add(double a, double b);
-  std::string concat(const std::string& a, const std::string& b);
-  std::string repeat(int count, const std::string& str);
-  void save(std::map<std::string, std::string> dict);
-  std::map<std::string, std::string> load();
-  void call_later(int msec, std::function<void()> f);
-  void except();
-  double twice(double n);
-};
-class SampleCxxModule : public module::CxxModule {
- public:
-  SampleCxxModule(std::unique_ptr<Sample> sample);
-  std::string getName();
-  virtual auto getConstants() -> std::map<std::string, folly::dynamic>;
-  virtual auto getMethods() -> std::vector<Method>;
-};
-} // namespace samples
-} // namespace xplat
-} // namespace facebook
-extern "C" facebook::xplat::module::CxxModule* SampleCxxModule();
-
 /// @src {packages/react-native/ReactCommon/cxxreact/SharedProxyCxxModule.h}:
 namespace facebook {
 namespace xplat {