chore: update cdk.json to use correct entrypoint in init-javascript test (#27257)

init-javascript.integtest.js is failing in the main pipeline with the following error:

```
Error: Cannot find module '/tmp/cdk-integ-0iwta1unfroo/new-entrypoing.mjs' 
```

This PR fixes this by correcting the spelling of `new-entrypoing` to `new-entrypoint`

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: colifran

packages/@aws-cdk-testing/cli-integ/tests/init-javascript/init-javascript.integtest.ts

@@ -49,7 +49,7 @@ new TestjsStack(app, 'TestjsStack');
 
   // Rewrite 'cdk.json' to use new entrypoint
   const cdkJson = await fs.readJson(path.join(context.integTestDir, 'cdk.json'));
-  cdkJson.app = 'node new-entrypoing.mjs';
+  cdkJson.app = 'node new-entrypoint.mjs';
   await fs.writeJson(path.join(context.integTestDir, 'cdk.json'), cdkJson);
 
   await shell.shell(['cdk', 'synth']);