Add tracing section for event loop tick work for IntersectionObserver (#51744)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51744

Changelog: [internal]

TSIA

Reviewed By: rshest

Differential Revision: D75789346

fbshipit-source-id: fa32cd3e5d9809bcbad48f0a6f1706efcce34d7f

packages/react-native/ReactCommon/react/renderer/observers/intersection/IntersectionObserverManager.cpp

@@ -243,6 +243,12 @@ void IntersectionObserverManager::updateIntersectionObservations(
   // In those cases it is ok to dispatch the notifications now, because the
   // current state is already accurate.
 
+  if (observersPendingInitialization_.empty()) {
+    return;
+  }
+
+  TraceSection s("IntersectionObserverManager::updateIntersectionObservations");
+
   std::unordered_map<SurfaceId, RootShadowNode::Shared> rootShadowNodeCache;
 
   for (auto observer : observersPendingInitialization_) {
@@ -297,7 +303,8 @@ void IntersectionObserverManager::updateIntersectionObservations(
     SurfaceId surfaceId,
     const RootShadowNode* rootShadowNode,
     HighResTimeStamp time) {
-  TraceSection s("IntersectionObserverManager::updateIntersectionObservations");
+  TraceSection s(
+      "IntersectionObserverManager::updateIntersectionObservations(mount)");
 
   std::vector<IntersectionObserverEntry> entries;