`typed-document-node` doesn't create export statement for all document fragments

### Which packages are impacted by your issue?

@graphql-codegen/typed-document-node
@graphql-codegen/near-operation-file-preset

### Describe the bug

1. When we create such document file:
```
import gql from 'graphql-tag';

export const CLIENT_FRAGMENT = gql`
fragment ClientFragment on Client {
id
email
}
`;

export const USER_FRAGMENT = gql`
fragment UserFragment on User {
id
email
client {
...ClientFragment
}
}
${CLIENT_FRAGMENT}
`;
```

2. then when we generate types, there is an error in `*.generated.ts` file.

Not all export fragment documents are created in `*.generated.ts` file.

It's interesting when we introduce such change:
```diff
export const USER_FRAGMENT = gql`
fragment UserFragment on User {
id
email
client {
- ...ClientFragment
}
}
- ${CLIENT_FRAGMENT}
`;
```

The export `ClientFragmentFragmentDoc` is created.

### Your Example Website or App

https://stackblitz.com/edit/github-eubitm

### Steps to Reproduce the Bug or Issue

1. Open the URL
2. run `npm run codegen`
3. open `test-fragment.document.generated.tsx`
4. you will see that there is an error:
> Cannot find name 'ClientFragmentFragmentDoc'. Did you mean 'UserFragmentFragmentDoc'?(2552)
5. the export document `ClientFragmentFragmentDoc` was not created

### Expected behavior

1. Open the URL
2. run `npm run codegen`
3. open `test-fragment.document.generated.tsx`
4. the export document `ClientFragmentFragmentDoc` exists

### Platform

- the newest versions of codegen

### Codegen Config File

```ts
const config: CodegenConfig = {
schema: 'schema.graphql',
documents: '**/*.document.ts',
generates: {
'types.ts': { plugins: ['typescript'] },
'/': {
preset: 'near-operation-file',
presetConfig: {
extension: '.generated.tsx',
baseTypesPath: 'types.ts',
},
plugins: ['typescript-operations', 'typed-document-node'],
config: {
documentMode: 'graphQLTag',
},
},
},
};
```