refactor: Merge type unwrapping for types into one step type aliases

[kitten]

Summary

Previously, to unwrap NON_NULL-like type references, we would have an outer type handling T | null for nullable types, and an inner type handling other refrences.
These two steps can be merged by adding an extra argument to the recursive parts of the type reference handler.

This should make some of these types more compact.

Set of changes

• Merge unwrapType with _unwrapTypeRec into unwrapTypeRec in selection.ts
• Merge unwrapType with _unwrapTypeRec into unwrapTypeRec in variables.ts
• Merge unwrapTypeRef with _unwrapTypeRefRec into unwrapTypeRefRec in variables.ts

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