Reduce visibility of DebugCorePackage (#41014)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/41014

DebugCorePackage is only used from com.facebook.react, there are no interesting usages internally at Meta or in OSS, so I'm reducing the visibility to package.

bypass-github-export-checks

changelog: [Android][Breaking] Reducing visibility of DebugCorePackage

Reviewed By: christophpurrer

Differential Revision: D50338294

fbshipit-source-id: db9b3be3b1899733a2f9d5f1cbeb314c2d350b57

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

@@ -36,7 +36,8 @@ import javax.inject.Provider;
     nativeModules = {
       JSCHeapCapture.class,
     })
-public class DebugCorePackage extends TurboReactPackage implements ViewManagerOnDemandReactPackage {
+/* package */
+class DebugCorePackage extends TurboReactPackage implements ViewManagerOnDemandReactPackage {
   private @Nullable Map<String, ModuleSpec> mViewManagers;
 
   public DebugCorePackage() {}