Fix ReactInstanceManager to add getJSIModule() as an alternate path (#…

…41495)

Summary:
Pull Request resolved: #41495

Fix ReactInstanceManager for adding the callsite of `getJSIModule()` as an alternate path to new way of Fabric initialization in order to make Catalyst and RN-Tester work with the changes for Fabric initialization

Reviewed By: javache

Differential Revision: D51338036

fbshipit-source-id: 49badac52f1032f1032a989b76dd422e3cf7582f

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManager.java

@@ -1407,9 +1407,10 @@ private ReactApplicationContext createReactContext(
               reactContext, catalystInstance.getJavaScriptContextHolder()));
     }
     if (ReactFeatureFlags.enableFabricRenderer) {
-      catalystInstance.getJSIModule(JSIModuleType.UIManager);
       if (mUIManagerProvider != null) {
         catalystInstance.setFabricUIManager(mUIManagerProvider.createUIManager(reactContext));
+      } else {
+        catalystInstance.getJSIModule(JSIModuleType.UIManager);
       }
     }
     if (mBridgeIdleDebugListener != null) {