fix list issues with test helper

[CatB1t]

WIP

Updates Summary

Functions that will always return NumPy arrays for values:

• array_values
• dtype_and_values
• dtypes_values_axis

Functions that will always return lists (If the number of elements is 1 or more):

• get_dtypes
• get_bounds

Flags that will always be generated as a list:

• native_array_flags
• as_variable_flags
• container_flags