`graphql.omit` will drop types, but you might need the types for a `.sudo` context

As seen in https://github.com/keystonejs/keystone/pull/8357, if you use `graphql.omit`, the types will be removed from your GraphQL schema, but that schema is not the same as your `.sudo` GraphQL schema, but now you're missing the types.

The types for `.sudo` need to be different.

Start by tracing the graphql.omit behavior and how the separate .sudo GraphQL schema is produced, using pull request #8357 for context. Determine how the sudo schema should differ, then verify that types needed there remain available while omitted types stay removed from the regular schema.

Written by the indexing model from the issue text.