fix(types): overrideTypes work on invalid embeded relation

[avallete]

• When a relation doesn't exist, or that type inference fail to resolve it the new type should be the source of truth for the result. In such case, we don't "merge" the properties together, but just replace the error with the user provided type.
• When chaining the override with .maybeSingle preserve the optionality of the result
• Allow merging between literal object and non literal one eg:

// Given some property like
{
   someProperty: Record<string, Json | null>
}
// calling
overrideType<{ someProperty: { literalProperty: string }  }>()
// result in:
{
    [key: string]: Json | null
    someProperty: { literalProperty: string }
} 

[github-actions]

🎉 This PR is included in version 1.19.2 🎉

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