Make select jsinspector tracing implementation headers private

Summary:
Mark the following tracing headers as private instead of for-frameworks. All of them are implementation details of React Native's tracing infrastructure, and no for-frameworks header includes them:

- `EventLoopReporter` is an RAII helper the runtime scheduler uses to report event loop task and microtask phases to the performance tracer. It is only used by `EventLoopReporter.cpp` and `RuntimeScheduler_Modern.cpp`.
- `RuntimeSamplingProfileTraceEventSerializer` turns a runtime sampling profile into trace events. It is only used by tracing sources, `TracingAgent.cpp` and its own unit test.
- `TraceEventSerializer` serializes trace events to `folly::dynamic`. It is only used by tracing sources and `TracingAgent.cpp`.
- `TraceEventGenerator` builds trace events for the performance tracer and the host profile serializer. It is only used by tracing sources and was already not exported in Buck.
- `ProfileTreeNode` is an auxiliary tree used to build the profile and deduplicate identical frames. It is only used by `RuntimeSamplingProfileTraceEventSerializer.cpp` and its own unit test.

Headers used by other React Native targets (`runtimescheduler`, `jsinspector`, `jsinspector_tracing`) stay exported in Buck. React Native's own targets define `RN_BUILDING`, so the private guard does not affect them.

Changelog: [Internal]

Differential Revision: D122780825

Author: coado

packages/react-native/ReactCommon/jsinspector-modern/tracing/EventLoopReporter.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #if defined(REACT_NATIVE_DEBUGGER_ENABLED)
 #include <React/Timing.h>

packages/react-native/ReactCommon/jsinspector-modern/tracing/ProfileTreeNode.h

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

packages/react-native/ReactCommon/jsinspector-modern/tracing/RuntimeSamplingProfileTraceEventSerializer.h

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

packages/react-native/ReactCommon/jsinspector-modern/tracing/TraceEventGenerator.h

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

packages/react-native/ReactCommon/jsinspector-modern/tracing/TraceEventSerializer.h

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