Reduce visibility of JSCJavaScriptExecutorFactory (#39737)

Summary:
Pull Request resolved: #39737

In an attempt to reduce footprint of React Native Android public APIs we are reducing visibility of classes and interfaces that are not meant to be used publicly OR are public but have no usages.
As part of our analysis, which involved looking for usages inside the Meta codebase and code search in OSS, we've detected that this class/interface is public but it's not used from other packages.

If you are using this class or interface please comment in this PR and we will restate the public access.

changelog: [Android][Changed] Reducing visibility of JSCJavaScriptExecutorFactory

Reviewed By: RSNara

Differential Revision: D49752141

fbshipit-source-id: 3f8a7a34cc1779aacb86a551e675876130173e70

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

@@ -9,7 +9,7 @@
 
 /** @deprecated use {@link com.facebook.react.jscexecutor.JSCExecutorFactory} instead. */
 @Deprecated
-public class JSCJavaScriptExecutorFactory implements JavaScriptExecutorFactory {
+class JSCJavaScriptExecutorFactory implements JavaScriptExecutorFactory {
   private final String mAppName;
   private final String mDeviceName;