Flatten using the wrong validity buffer for LargeList(LargeList)

[sdf-jkl]

Describe the bug

While working on #18363 I saw an inconsistency within match arm logic for different inner List types for LargeList.

-let (inner_field, inner_offsets, inner_values, nulls) =  // in LargeList(LargeList)
+let (inner_field, inner_offsets, inner_values, _) = // in LargeList(List)
                        as_list_array(&values)?.clone().into_parts();

let flattened_array = GenericListArray::<i64>::new(
                        inner_field,
                        offsets,
                        inner_values,
                        nulls, <------- the validity buffer is used here
                    );

To Reproduce

To reproduce the error, I fixed an existing sqllogictest to have LargeList(nullable LargeList(nullable Int64))
This way when we generate a flattened_array the validity buffer's len and values difference will cause an error.

External error: task 26 panicked with message "called `Result::unwrap()` on an `Err` value: InvalidArgumentError(\"Incorrect length of null buffer for LargeListArray, expected 1 got 5\")"

Expected behavior

The expected behavior is to pass the new sqllogictest

flatten(arrow_cast(make_array([1], null, [2, 3], [null], make_array(4, null, 5)), 'LargeList(LargeList(Int64))')),
----
[1, NULL, 2, 3, NULL, 4, NULL, 5]

Additional context

No response