Function apply_capture_kind_on_capture_ty 

fn apply_capture_kind_on_capture_ty<'db>(
    interner: DbInterner<'db>,
    ty: Ty<'db>,
    capture_kind: UpvarCapture,
    region: Region<'db>,
) -> Ty<'db>

Returns a Ty that applies the specified capture kind on the provided capture Ty