Fix isRootVisible not working with non-Venice

Summary:
## Context
```isRootViewVisible``` doesn't work as expected for non-Venice: when enter Marketplace tab, ```isRootViewVisible```  should returns true with Marketplace tab's rootViewTag, but it returns false.

## Root cause
```rootViewTag``` is added to "mVisibleRootTags" in "FbReactRootVisibilityTracker" when ```BaseFbReactFragment.onViewDidAppear()``` gets called, but ```BaseFbReactFragment.onViewDidAppear()``` is called earlier than when the ```rootViewTag``` is set.

## Fix
Move setRootViewTag to earlier when RootView is created instead of in startSurface or mounting.

Changelog:
[Android][Changed] - Move setRootViewTag to earlier when RootView is created

Reviewed By: RSNara

Differential Revision: D38586584

fbshipit-source-id: aec3ed37eb62289a19794e68b1a6b5ca213cb14a

ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManager.java

@@ -1260,7 +1260,6 @@ public class ReactInstanceManager {
                   : Arguments.fromBundle(initialProperties),
               reactRoot.getWidthMeasureSpec(),
               reactRoot.getHeightMeasureSpec());
-      reactRoot.setRootViewTag(rootTag);
       reactRoot.setShouldLogContentAppeared(true);
     } else {
       rootTag =