Fix issue in typeSelection.ts when handling nullable non-scalars

[olee]

When using this library, I notices some strange issues with the output types when relations were not marked as required.

Will try to provide a full example of a schema plus the broken typings the unmodified / modified variants generate later if required.

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Name	Status	Preview	Comments	Updated (UTC)
genql	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 8, 2024 3:04am

[remorses]

Can you add an example here? https://github.com/remorses/genql/blob/master/integration-tests/schema.graphql

And a test here if possible https://github.com/remorses/genql/blob/master/integration-tests/tests/execution.ts

To run test go inside integration-tests and run pnpm gen && pnpm test

[olee]

Will see if I can add those soon, thx.

[remorses]

Even just the graphql schema is enough, I can add tests myself