### What?
Makes several fields and list item types in query results (e.g. `docs`)
non-nullable.
### Why?
When dealing with code generated from a Payload GraphQL schema, it is
often necessary to use type guards and optional chaining.
For example:
```graphql
type Posts {
docs: [Post]
...
}
```
This implies that the `docs` field itself is nullable and that the array
can contain nulls. In reality, neither of these is true. But because of
the types generated by tools like `graphql-code-generator`, the way to
access `posts` ends up something like this:
```ts
const posts = (query.data.docs ?? []).filter(doc => doc != null);
```
Instead, we would like the schema to be:
```graphql
type Posts {
docs: [Post!]!
...
}
```
### How?
The proposed change involves adding `GraphQLNonNull` where appropriate.
---------
Co-authored-by: Dan Ribbens <dan.ribbens@gmail.com>
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