Make internal mounting headers private (#58857)

Summary:
Pull Request resolved: #58857

Switch `internal/CullingContext.h`, `internal/ShadowViewNodePair.h`, `internal/sliceChildShadowNodeViewPairs.h` and `updateMountedFlag.h` in `react/renderer/mounting` to `PrivateGuard.h`. They are implementation details of the differentiator, the mounting coordinator and the shadow tree, included only from the module's own sources.

Changelog: [Internal]

___

Differential Revision: D123415164

fbshipit-source-id: 4ec6788862277710f56210856c67ed4bfde5ac2e

Author: j-piasecki

packages/react-native/ReactCommon/react/renderer/mounting/internal/CullingContext.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/Graphics.h>
 

packages/react-native/ReactCommon/react/renderer/mounting/internal/ShadowViewNodePair.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/Graphics.h>
 #include <React/RendererCore.h>

packages/react-native/ReactCommon/react/renderer/mounting/internal/sliceChildShadowNodeViewPairs.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <deque>
 

packages/react-native/ReactCommon/react/renderer/mounting/updateMountedFlag.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/RendererCore.h>
 #include <react/renderer/mounting/ShadowTree.h>