[ReactNative] Guard agains errors during reconciliation

Summary:
@public

After refactoring the MessageQueue a guard was missing on around `batchedUpdates`
call.

Test Plan: Introduce an error on `getInitialState` of `AdsManagerTabsModalView.ios.js`

Libraries/Utilities/MessageQueue.js

@@ -76,6 +76,7 @@ class MessageQueue {
    * Public APIs
    */
   processBatch(batch) {
+    guard(() => {
       ReactUpdates.batchedUpdates(() => {
         batch.forEach((call) => {
           let method = call.method === 'callFunctionReturnFlushedQueue' ?
@@ -85,6 +86,7 @@ class MessageQueue {
         BridgeProfiling.profile('ReactUpdates.batchedUpdates()');
       });
       BridgeProfiling.profileEnd();
+    });
     return this.flushedQueue();
   }