Cover react/nativemodule/defaults:defaults with Stable API guards (#58118)

Summary:
Pull Request resolved: https://github.com/react/react-native/pull/58118

Classifies `react/nativemodule/defaults` as a private target under the three-tier C++ stable API visibility model. `DefaultTurboModules.h` now includes `<react/cxxstableapi/PrivateGuard.h>`, and the module picks up a dependency on the guard target so the include resolves for every build.

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D116287984

fbshipit-source-id: c0018bba702b7885cd4acac744625c5e2d42dd35

packages/react-native/ReactCommon/react/nativemodule/defaults/CMakeLists.txt

@@ -15,6 +15,7 @@ target_include_directories(react_nativemodule_defaults PUBLIC ${REACT_COMMON_DIR
 
 target_link_libraries(react_nativemodule_defaults
         react_codegen_rncore
+        react_cxxstableapi
         react_nativemodule_core
         react_nativemodule_dom
         react_nativemodule_devtoolsruntimesettings

packages/react-native/ReactCommon/react/nativemodule/defaults/DefaultTurboModules.h

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+#include <react/cxxstableapi/PrivateGuard.h>
+
 #include <ReactCommon/TurboModule.h>
 
 namespace facebook::react {

packages/react-native/ReactCommon/react/nativemodule/defaults/React-defaultsnativemodule.podspec

@@ -58,6 +58,7 @@ Pod::Spec.new do |s|
   s.dependency "React-viewtransitionnativemodule"
   s.dependency "React-webperformancenativemodule"
   s.dependency "React-Fabric/animated"
+  s.dependency "React-cxxstableapi"
   add_dependency(s, "React-RCTFBReactNativeSpec")
   add_dependency(s, "React-featureflags")
   add_dependency(s, "React-featureflagsnativemodule")