chore: make does-not-exist.json actually not exist (#20986)

Somehow this file got checked in. Remove it.


----

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

Author: rix0rrr

packages/aws-cdk/does-not-exist.json

@@ -325,6 +325,10 @@ describe('cli notices', () => {
       expect(debugSpy).not.toHaveBeenCalled();
 
       debugSpy.mockRestore();
+
+      if (fs.existsSync('does-not-exist.json')) {
+        fs.unlinkSync('does-not-exist.json');
+      }
     });
 
     test('retrieved data from the delegate when it is configured to ignore the cache', async () => {