Unbreak build_android due to broken StateReconciliationTest.cpp (#51161)

Summary:
Pull Request resolved: #51161

This unbreaks the CI after D74245228

Changelog:
[Internal] [Changed] -

Reviewed By: javache

Differential Revision: D74324800

fbshipit-source-id: b89147f4f57b5d94fd8ae1549ef18ef2deb97c5b

Author: cortinico

packages/react-native/ReactCommon/react/renderer/mounting/tests/StateReconciliationTest.cpp

@@ -277,7 +277,7 @@ TEST_F(StateReconciliationTest, testCloneslessStateReconciliationDoesntClone) {
 
   // ==== Creact clones tree ====
 
-  ShadowNode::Unshared newlyClonedShadowNode;
+  std::shared_ptr<ShadowNode> newlyClonedShadowNode;
 
   auto rootShadowNodeClonedFromReact = rootShadowNode2->cloneTree(
       scrollViewFamily, [&](const ShadowNode& oldShadowNode) {
@@ -369,7 +369,7 @@ TEST_F(StateReconciliationTest, testStateReconciliationScrollViewChildUpdate) {
 
   // ==== React starts cloning but does not commit ====
 
-  ShadowNode::Unshared newlyClonedViewShadowNode;
+  std::shared_ptr<ShadowNode> newlyClonedViewShadowNode;
 
   auto rootShadowNodeClonedFromReact = initialRootShadowNode->cloneTree(
       initialChildViewShadowNode->getFamily(),