(Easy) Remove usage of already-removed CrashyCrash from RNTester

Summary:
`const {CrashyCrash} = NativeModules` makes all of RNTesterAppRoute render blank in Bridgeless.

Remove this test example because the CrashyCrash has not existed since 2019, and no similar module exists in open source. [[github]](8ec7e09)

Changelog: [Internal]

Reviewed By: philIip

Differential Revision: D33644122

fbshipit-source-id: ed10e8bf8ea9af9d5904afc2a7d9c2b3b3606978

packages/rn-tester/js/examples/Crash/CrashExample.js

@@ -9,11 +9,9 @@
  */
 
 import type {Node} from 'React';
-import {NativeModules, Button} from 'react-native';
+import {Button} from 'react-native';
 import React from 'react';
 
-const {CrashyCrash} = NativeModules;
-
 exports.displayName = (undefined: ?string);
 exports.framework = 'React';
 exports.title = 'Crash';
@@ -36,17 +34,4 @@ exports.examples = [
       );
     },
   },
-  {
-    title: 'Native crash',
-    render(): Node {
-      return (
-        <Button
-          title="Native crash"
-          onPress={() => {
-            CrashyCrash.letsCrash();
-          }}
-        />
-      );
-    },
-  },
 ];