Live examples bug: Opting out and back into `Client Preset` results in `syntax error`

### Describe the bug

On live examples, opting out and back into `Client Preset` result in `Syntax Error: Unexpected Name "import"`.

### Your Example Website or App

https://the-guild.dev/graphql/codegen

### Steps to Reproduce the Bug or Issue

1. Go to codegen homepage
2. select example other than Client Preset
3. reselect Client Preset
4. see generated output

### Expected behavior

example generation should work fine on every run :)

### Screenshots or Videos

[_No response_](https://github.com/dotansimha/graphql-code-generator/assets/56203151/11cb1315-04d1-42e6-91c7-2d1a96c2cf5b)