Upgrade RendererBridging visibility to "for frameworks" (#58286)

Summary:
Pull Request resolved: #58286

Reclassifies `react/renderer/bridging:bridging` from public to "for frameworks" under the C++ stable API three-tier visibility model.

Consumers that opt into `RN_STRICT_API` now get a suppressible warning where they previously got an error pointing at the umbrella, and can acknowledge it with `RN_ALLOW_FRAMEWORKS`; without that flag the guards are inert, so no existing build changes behaviour.

Changelog: [Internal]

Reviewed By: christophpurrer

Differential Revision: D118440441

Author: j-piasecki

packages/react-native/ReactAndroid/build.gradle.kts

@@ -127,7 +127,6 @@ val preparePrefab by
                       ),
                       // react_renderer_bridging
                       Pair("../ReactCommon/react/renderer/bridging/", "react/renderer/bridging/"),
-                      Pair("../ReactCommon/react/renderer/bridging/React/", "React/"),
                       // react_renderer_componentregistry
                       Pair(
                           "../ReactCommon/react/renderer/componentregistry/",

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

@@ -84,16 +84,10 @@ Pod::Spec.new do |s|
 
   s.subspec "bridging" do |ss|
     ss.source_files         = podspec_sources("react/renderer/bridging/**/*.{m,mm,cpp,h}", "react/renderer/bridging/**/*.{h}")
-    ss.exclude_files        = ["react/renderer/bridging/tests", "react/renderer/bridging/React"]
+    ss.exclude_files        = "react/renderer/bridging/tests"
     ss.header_dir           = "react/renderer/bridging"
   end
 
-  s.subspec "bridgingUmbrella" do |ss|
-    ss.source_files         = "react/renderer/bridging/React/*.h"
-    ss.header_dir           = ""
-    ss.header_mappings_dir  = "react/renderer/bridging"
-  end
-
   s.subspec "core" do |ss|
     header_search_path = [
       "\"$(PODS_TARGET_SRCROOT)/ReactCommon\"",

packages/react-native/ReactCommon/react/renderer/bridging/React/RendererBridging.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/FrameworksGuard.h>
 
 #include <jsi/jsi.h>
 #include <react/bridging/Base.h>

packages/react-native/ReactCommon/react/renderer/bridging/bridging.h

@@ -70,19 +70,10 @@ const PodspecExceptions /*: {[key: string]: PodSpecConfiguration} */ = {
       {
         name: 'bridging',
         headerPatterns: ['react/renderer/bridging/**/*.h'],
-        excludePatterns: [
-          'react/renderer/bridging/tests',
-          'react/renderer/bridging/React',
-        ],
+        excludePatterns: ['react/renderer/bridging/tests'],
         headerDir: 'react/renderer/bridging',
       },
 
-      {
-        name: 'bridgingUmbrella',
-        headerPatterns: ['react/renderer/bridging/React/*.h'],
-        headerDir: 'React',
-      },
-
       {
         name: 'core',
         headerPatterns: ['react/renderer/core/**/*.h'],