Migrate UIManager.getViewManagerConfig -> UIManager.hasViewManagerCon…

…fig in SnapshotViewIOS

Summary:
This diff and stack migratest Migrate UIManager.getViewManagerConfig -> UIManager.hasViewManagerConfig
This is necessary to avoid initializing UIManagerModule to detect if a component is registered into the native platform

changelog: [internal] internal

Reviewed By: sammy-SC

Differential Revision: D27276525

fbshipit-source-id: a9b6ad05e6d3e47df9efad75e42411a441f7a779

packages/rn-tester/js/examples/Snapshot/SnapshotViewIOS.ios.js

@@ -22,7 +22,7 @@ import type {ViewProps} from 'react-native/Libraries/Components/View/ViewPropTyp
 // Verify that RCTSnapshot is part of the UIManager since it is only loaded
 // if you have linked against RCTTest like in tests, otherwise we will have
 // a warning printed out
-const RCTSnapshot = UIManager.getViewManagerConfig('RCTSnapshot')
+const RCTSnapshot = UIManager.hasViewManagerConfig('RCTSnapshot')
   ? require('../../../RCTTest/RCTSnapshotNativeComponent')
   : View;