Silence all Lean Core warnings in Prelude.js

Summary:
See https://fb.workplace.com/permalink.php?story_fbid=2337018256625463&id=100009037038038&substory_index=58 for motivation.

I opted for using a substring that is unlikely to come up in warnings in product code but is shared across all lean core warnings. I think this is good enough and won't require updates every time we deprecate a new module.

Reviewed By: yungsters

Differential Revision: D16073431

fbshipit-source-id: 136b9e8ab53c85d2de5ed7844780f5d082087a7d

Libraries/react-native/react-native-implementation.js

@@ -25,7 +25,7 @@ module.exports = {
   get ART() {
     warnOnce(
       'art-moved',
-      'React Native Art has been extracted from react-native core and will be removed in a future release. ' +
+      'React Native ART has been extracted from react-native core and will be removed in a future release. ' +
         "It can now be installed and imported from '@react-native-community/art' instead of 'react-native'. " +
         'See https://github.com/react-native-community/art',
     );
@@ -174,7 +174,7 @@ module.exports = {
   get AsyncStorage() {
     warnOnce(
       'async-storage-moved',
-      'Async Storage has been extracted from react-native core and will be removed in a future release. ' +
+      'AsyncStorage has been extracted from react-native core and will be removed in a future release. ' +
         "It can now be installed and imported from '@react-native-community/async-storage' instead of 'react-native'. " +
         'See https://github.com/react-native-community/react-native-async-storage',
     );