Fixing unreferenced parameter warnings as errors in Playground-Composition and elsewhere (#14678)

## Description
Resolved all warnings which caused build errors in Playground-Composition and RNTesterApp-Fabric.

### Type of Change
- Bug fix (non-breaking change which fixes an issue)

### Why
Fix build errors in CI and blocking PRs.

Resolves #14677 

### What
Commented out unreferenced variable names. Also re-ran package.json evaluation.

## Screenshots
N/A

## Testing
Verified projects built without warnings in latest VS.

## Changelog
Should this change be included in the release notes: _no_

Author: jonthysell

change/react-native-windows-a685d11b-c3de-4d07-bb62-c1f2cffa0f25.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Fixing unreferenced parameter warnings as errors in Playground-Composition and elsewhere",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/e2e-test-app-fabric/windows/RNTesterApp-Fabric/RNTesterApp-Fabric.cpp

@@ -94,7 +94,7 @@ winrt::Microsoft::ReactNative::ReactNativeHost CreateReactNativeHost(
 #endif
 
   host.InstanceSettings().InstanceLoaded(
-      [](auto sender, const winrt::Microsoft::ReactNative::InstanceLoadedEventArgs &args) {
+      [](auto /*sender*/, const winrt::Microsoft::ReactNative::InstanceLoadedEventArgs &args) {
         global_reactContext = args.Context();
       });
 
@@ -168,7 +168,7 @@ WinMain(HINSTANCE /* instance */, HINSTANCE, PSTR /* commandLine */, int /* show
         // Before we shutdown the application - unload the ReactNativeHost to give the javascript a chance to save any
         // state
         auto async = host.UnloadInstance();
-        async.Completed([host](auto asyncInfo, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
+        async.Completed([host](auto /*asyncInfo*/, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
           asyncStatus;
           assert(asyncStatus == winrt::Windows::Foundation::AsyncStatus::Completed);
           host.InstanceSettings().UIDispatcher().Post([]() { PostQuitMessage(0); });
@@ -331,7 +331,7 @@ void InsertExpandCollapseStateValueIfNotDefault(
   }
 }
 
-winrt::Windows::Data::Json::JsonObject ListErrors(winrt::Windows::Data::Json::JsonValue payload) {
+winrt::Windows::Data::Json::JsonObject ListErrors(winrt::Windows::Data::Json::JsonValue /*payload*/) {
   winrt::Windows::Data::Json::JsonObject result;
   winrt::Windows::Data::Json::JsonArray jsonErrors;
   winrt::Windows::Data::Json::JsonArray jsonWarnings;

packages/playground/windows/playground-composition/Playground-Composition.cpp

@@ -53,7 +53,7 @@ void RegisterCustomComponent(winrt::Microsoft::ReactNative::IReactPackageBuilder
  */
 struct EllipseImageHandler
     : winrt::implements<EllipseImageHandler, winrt::Microsoft::ReactNative::Composition::IUriImageProvider> {
-  bool CanLoadImageUri(winrt::Microsoft::ReactNative::IReactContext context, winrt::Windows::Foundation::Uri uri) {
+  bool CanLoadImageUri(winrt::Microsoft::ReactNative::IReactContext /*context*/, winrt::Windows::Foundation::Uri uri) {
     return uri.SchemeName() == L"ellipse";
   }
 
@@ -114,7 +114,6 @@ winrt::Windows::UI::Composition::Compositor g_compositor{nullptr};
 constexpr auto WindowDataProperty = L"WindowData";
 
 int RunPlayground(int showCmd, bool useWebDebugger);
-winrt::Microsoft::ReactNative::IReactPackageProvider CreateStubDeviceInfoPackageProvider() noexcept;
 
 struct WindowData {
   static HINSTANCE s_instance;
@@ -239,12 +238,12 @@ struct WindowData {
                 ::SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SIZEBOX);
                 m_compRootView.SizeChanged(
                     [hwnd, props = InstanceSettings().Properties()](
-                        auto sender, const winrt::Microsoft::ReactNative::RootViewSizeChangedEventArgs &args) {
+                        auto /*sender*/, const winrt::Microsoft::ReactNative::RootViewSizeChangedEventArgs &args) {
                       auto compositor =
                           winrt::Microsoft::ReactNative::Composition::CompositionUIService::GetCompositor(props);
                       auto async = compositor.RequestCommitAsync();
                       async.Completed([hwnd, size = args.Size()](
-                                          auto asyncInfo, winrt::Windows::Foundation::AsyncStatus /*asyncStatus*/) {
+                                          auto /*asyncInfo*/, winrt::Windows::Foundation::AsyncStatus /*asyncStatus*/) {
                         RECT rcClient, rcWindow;
                         GetClientRect(hwnd, &rcClient);
                         GetWindowRect(hwnd, &rcWindow);
@@ -340,7 +339,7 @@ struct WindowData {
       case IDM_UNLOAD: {
         auto async = Host().UnloadInstance();
         async.Completed([&, uidispatch = InstanceSettings().UIDispatcher()](
-                            auto asyncInfo, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
+                            auto /*asyncInfo*/, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
           asyncStatus;
           OutputDebugStringA("Instance Unload completed\n");
 
@@ -583,7 +582,7 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
             L"ReactNative.Composition", L"CompositionContext"});
 
         auto async = data->m_host.UnloadInstance();
-        async.Completed([host = data->m_host](auto asyncInfo, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
+        async.Completed([host = data->m_host](auto /*asyncInfo*/, winrt::Windows::Foundation::AsyncStatus asyncStatus) {
           asyncStatus;
           assert(asyncStatus == winrt::Windows::Foundation::AsyncStatus::Completed);
           host.InstanceSettings().UIDispatcher().Post([]() { PostQuitMessage(0); });