Use event handlers instead of listeners for error handing

Summary:
^

Adding listeners was correctly intercepting events but the event object often lacked the information necessary to correctly triage and fix an issue.

I discovered that by subscribing to these events directly, the event object did have the required information.

Changelog: Use global window event handlers instead of listeners

Reviewed By: antonk52

Differential Revision: D39809292

fbshipit-source-id: 8a0fc7b7cd86ea16e40f2dc383bc30364f6fc16c

desktop/flipper-ui-core/src/utils/globalErrorHandling.tsx

@@ -9,11 +9,11 @@
 
 export const startGlobalErrorHandling = () => {
   if (typeof window !== 'undefined') {
-    window.addEventListener('error', (event) => {
-      console.error('"error" event intercepted:', event.error);
-    });
-    window.addEventListener('unhandledrejection', (event) => {
+    window.onerror = (event) => {
+      console.error('"onerror" event intercepted:', event);
+    };
+    window.onunhandledrejection = (event) => {
       console.error('"unhandledrejection" event intercepted:', event.reason);
-    });
+    };
   }
 };